Wei-Ling discovered through a genealogy research that one of her fifteenth-generation ancestors was a foumous Chinese military leader. How many descendants does this ancestor have in the fifteenth-generation, assuming each descendent had an average of 2. 5 children?

Answers

Answer 1

Wei-Ling's fifteenth-generation ancestor is estimated to have around 1,220,703 descendants.

Assuming that each descendant has an average of 2.5 children, we can use the formula:

number of descendants = (2.5)^n

where n is the number of generations.

In this case, n = 15 (fifteenth-generation), so we can plug in the values and get:

number of descendants = [tex](2.5)^{15}[/tex]= 1,220,703.125

Therefore, Wei-Ling's fifteenth-generation ancestor is estimated to have around 1,220,703 descendants. However, it is important to note that this is just an estimation and may not be entirely accurate due to various factors such as reproductive rates and other variables.

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In an obstacle course, participants climb to the top of a tower and use a zip line to travel across a mud pit. The zip line extends from the top of a tower to a point on the ground 48. 2 feet away from the base of the tower. The angle of elevation of the zip line is 33°. Estimate the length of the zip line to the nearest tenth of a foot

Answers

The estimated length of the zip line is 62.8 feet.

The length of a zip line can be estimated using the formula for the length of a side of a right triangle, which is the square root of the sum of the squares of the two shorter sides. In the case of the obstacle course, the two shorter sides are the height of the tower and the horizontal distance from the base of the tower to the point on the ground.

To calculate the length of the zip line, we first need to calculate the height of the tower. The angle of elevation of the zip line is 33°, so we can use trigonometry and the Law of Sines to calculate the height of the tower. The Law of Sines states that the ratio of the length of a side to the sine of its opposite angle is the same for all sides of the triangle. Since we know the angle of elevation (33°) and the horizontal distance (48.2 feet), we can calculate the height of the tower using the formula:

h = (48.2 * sin(33°)) / sin(90°)

h = 42.7 feet

Now we can calculate the length of the zip line using the formula for the length of a side of a right triangle:

[tex]L = sqrt(h^2 + d^2)L = sqrt(42.7^2 + 48.2^2)L = 62.8 feet[/tex]

Rounding to the nearest tenth of a foot, the length of the zip line is 62.8 feet.

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i can’t figure this out out!! extra points

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Step-by-step explanation:

as I just explained in your other posting of the same question :

y = cos(30) × 8 = sqrt(3)/2 × 8 = 4×sqrt(3).

so, the number in the green box is 4.

A central angle has a measure of 2. 3 radians and the subtended arc length is 12 cm. What is the radius of the circle to the nearest 10th

Answers

If A central angle has a measure of 2. 3 radians and the subtended arc length is 12 cm, then the radius of the circle is approximately 5.2 cm.

The formula relating the central angle, radius, and arc length of a circle is:

arc length = radius × central angle

We can use this formula to find the radius of the circle, given the central angle and arc length.

Substituting the given values, we get:

12 cm = r × 2.3 rad

Solving for r, we divide both sides by 2.3 rad:

r = 12 cm / 2.3 rad

Using a calculator, we get:

r ≈ 5.2174 cm

Rounding to the nearest tenth, we get:

r ≈ 5.2 cm

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Start by creating two different circles:


`◍ Create a point, and label it A. To make the remainder of the activity easier, choose integers for the x and y coordinates of point A.

◍ Create a circle with its center at point A and with a radius of your choice. To make the remainder of the activity easier, choose an integer value for the radius.

◍ Create another point, and label it B. To make the remainder of the activity easier, choose integers for the x and y coordinates of the point.

◍ Create a circle with its center at point B and with a radius of your choice that is different from the radius chosen for circle A. To make the remainder of the activity easier, choose an integer value for the radius

Answers

The integers and radius for different circles as instructed are; (1.) Circle A (1, 3) with r= 3   (2.) Circle B (5, 3) with r= 5.

How to create the circles with integers and radius as instructed?

1. On a y and x graph, create a dot and get the integers for the dot which are the numbers you find when you trace the dot to the x and y axis.

Integers are a set of numbers that include positive numbers, negative numbers, and zero. Integers are whole numbers (not fractions or decimals) that can be represented on the number line. Examples of integers include -3, -2, -1, 0, 1, 2, 3, and so on.

For the diagram below, diagram A and B share a similar point at the y axis and a different point at the x axis. There integers are

A ( 1, 3) and

B (5, 3)

The radius of choice for A is r= 3

The radius of choice for B is r= 5

Therefore the diagram should look like the one in the attached file.

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A rectangular swimming pool is bordered by a concrete patio. The width of the patio is the same on every side. The area of the surface of the pool is equal to the area of the patio. What is the width of the patio?

Answers

Length times width = area of a rectangle.

16ft×24ft= 384

Area of the patio since all sides are equal to

4

width×width×width×width= 384

Answer=4.4267276788

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Determine whether statement (3) follows from statements (1) and (2) by the Law of Detachment or the Law of Syllogism. If it does, state which law was used. If it does not, write invalid.



(1) If you use a pencil you can erase mistakes.

(2) If you can erase mistakes your paper will be neater.

(3) If you use a pencil your paper will be neater.


A. Invalid

B. Yes; Law of Detachment

C. Yes; Law of Syllogism

Answers

Statement (3) follows from statements (1) and (2) by the Law of Syllogism. So, the correct option c) which is Yes; Law of Syllogism

Here's the reasoning:

(1) If you use a pencil you can erase mistakes.

(2) If you can erase mistakes your paper will be neater.

Therefore, by the Law of Syllogism,

(3) If you use a pencil your paper will be neater.

The Law of Syllogism states that if we have two conditional statements (if A then B) and (if B then C), we can logically conclude a third conditional statement (if A then C). That's exactly what we've done here since statement (1) is the first conditional statement, statement (2) is the second conditional statement, and statement (3) is the conclusion that follows from applying the Law of Syllogism to the first two statements.

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rick has 3x and helen has twice that amount they save 3 each per week what amount will be the sum of their money 4 weeks from now

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Hence the amount of savings of Rick and Halens is = 9x+24.

When we write any linguistic statement in mathematics form called mathematical expression.

Rick has 3x to start with

Let w = the number of weeks he will save.

Savings = 3x + 3*w  

Let w = 4

Savings = 3x+3*4

Savings = 3x + 12

Halen has twice Rick's amount,

Let w = the number of weeks she will save.

Savings=6x+3w

let w=4

savings=6x+12

Now we come to the question. It seems to want the total combining both of them.

Rick + Halen =  3x+12+6x+12 = 9x+24

Hence the amount of savings of rick and Halens is = 9x+24.

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Number of Downloads by Quarter In the 3rd quarter, approximately how many more downioads were there of Starship than Flurry? 1.5 million 1.75 milion 2 million 2.25 miltion

Answers

The number of downloads of Starship than Flurry include the following: A. 1.5 million.

What is a line plot?

In Mathematics and Statistics, a line plot can be defined as a type of graph that is used to graphically represent a data set above a number line, while using crosses, dots, or any other mathematical symbol.

Based on the data and information provided in the line plot shown in the image attached below, we can logically deduce the following parameters and key features:

Red line represent Starship.Purple line represent Flurry.At 3rd quarter, Starship = 3 million downloads.At 3rd quarter, Flurry = 1.5 million downloads.

Next, we would calculate the difference between the downloads in the  3rd quarter for Starship and Flurry as follows;

Difference = 3 million downloads - 1.5 million downloads.

Difference = 1.5 million downloads.

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A city has 5 new houses for every 8 old houses. If there are 30 new houses in the city, how many old houses are there?

Answers

There should be 48 old houses. 30/5=6 and if there are 5 houses for every 8 old you would do 8 • 6 which equals 48

Answer: 48 old houses

Step-by-step explanation:

Ratio 5:8

Ratio 30:?

30/5=6

8 x 6= ...

48!!!

30:48

did this make sense??

represent 1:50000 in 2 different method

Answers

The answer of the question based on the representing the value in two different methods are given below;

What is Distance?

Distance refers to amount of space between the two objects or points in the space. It is measure of  length of  path traveled by object or person from one point to the another.

Distance can be measured in various units like  meters, kilometers, feet, miles, etc. It is fundamental concept in a  geometry and is used in a various areas of science, engineering, and everyday life.

1:50000 can be represented in two different ways as follows:

Ratio: The expression "1:50000" represents the ratio of one unit on a map to 50,000 units on the ground. This means that one unit of distance on the map corresponds to 50,000 units of distance on the ground. For example, if one unit on the map represents one meter, then 50,000 meters (or 50 kilometers) on the ground would be represented by one unit on the map.Decimal: 1:50000 can also be represented in decimal form as 0.00002. This is obtained by dividing 1 by 50,000, which gives the proportion of one unit on the map to the corresponding distance on the ground. This can be useful for calculations that involve scaling or converting distances between map and ground measurements.

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The product of two positive number is 108. If one one number is treble of other number, find those number​

Answers

Let's assume that the smaller of the two positive numbers is x. Then we can express the larger number as 3x, since it is three times the smaller number.

We are given that the product of the two numbers is 108, so we can write:

x * 3x = 108

Simplifying this equation, we get:

3x^2 = 108

Dividing both sides by 3, we get:

x^2 = 36

Taking the square root of both sides, we get:

x = 6

Since x is the smaller of the two numbers, the larger number is 3x, which is:

3x = 3(6) = 18

Therefore, the two positive numbers are 6 and 18. We can check that their product is indeed 108:

6 * 18 = 108

So the solution is that the two positive numbers are 6 and 18.
Let's call the smaller number "x". Since the larger number is treble the smaller number, we can call it "3x". We know that the product of these two numbers is 108, so we can set up an equation:

x * 3x = 108

Simplifying the left side of the equation:

3x^2 = 108

Dividing both sides by 3:

x^2 = 36

Taking the square root of both sides:

x = 6

Since the smaller number is 6, we can find the larger number by multiplying it by 3:

3x = 3(6) = 18

Therefore, the two numbers are 6 and 18.

Which two points would a line of fit go through to best fit the data? (6, 4) and (9, 1) (3, 5) and (10, 1) (1, 8) and (10, 1) (1, 5) and (7, 3)

Answers

The two points that a line of fit would go through to best fit the data are (3, 5) and (10, 1).

We need to find which pair of points have a line passing through them that best fits the data. One way to do this is to calculate the slope of the line passing through each pair of points and choose the pair of points with the slope closest to the average slope.

The slope of a line passing through two points [tex](x_1, y_1)[/tex]  [tex](x_2, y_2)[/tex] is given by the formula:

slope = [tex]\frac{(y_2 - y_1)}{ (x_2 - x_1)}[/tex]

Using this formula, we can calculate the slopes of the lines passing through each pair of points:

Pair 1: slope = [tex]\frac{(1 - 4)}{(9-6)}[/tex]  = -1

Pair 2: slope = [tex]\frac{(1 - 5)}{(10-3)}[/tex] = -0.67

Pair 3: slope = [tex]\frac{(1 - 8) }{(10-1)}[/tex] = -0.88

Pair 4: slope =[tex]\frac{ (3 - 5)}{(7-1)}[/tex] = -0.33

The average slope is:

average slope = [tex]\frac{(-1 + (-0.67) + (-0.88) + (-0.33))}{4}[/tex] = -0.72

The pair of points with the slope closest to the average slope is pair 2, with a slope of -0.67. Therefore, the two points that a line of fit would go through to best fit the data are (3, 5) and (10, 1).

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10 Li + Hd₂O5 -> 5 Li₂O + 2 Hd + Energy
What simple reaction type is this (5 points)?
What specific reaction type is this (5 points)?
What device can we use to measure the amount of energy released (5 points)?

Answers

This is a single displacement reaction. Specifically, this is a metal displacement reaction. We can use a calorimeter to measure the amount of energy released.

Describe Reaction?

A reaction, in chemistry, is a process in which two or more substances (reactants) interact with each other to form new substances (products). Reactions involve the breaking and forming of chemical bonds between atoms or molecules, which results in the rearrangement of atoms into new chemical compounds.

Reactions can be classified into several different types, depending on the nature of the reactants and products, the conditions under which the reaction occurs, and the rate of the reaction. Some common types of reactions include:

Combination (or synthesis) reactions, in which two or more substances combine to form a single product.

Decomposition reactions, in which a single substance breaks down into two or more simpler substances.

Single replacement (or displacement) reactions, in which one element replaces another element in a compound.

Double replacement (or metathesis) reactions, in which two compounds exchange ions to form two new compounds.

Acid-base reactions, in which an acid reacts with a base to form a salt and water.

Redox (or oxidation-reduction) reactions, in which electrons are transferred between reactants.

This is a single displacement reaction.

Specifically, this is a metal displacement reaction.

We can use a calorimeter to measure the amount of energy released.

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The given chemical equation represents a single displacement reaction and a calorimeter can be used to measure the amount of energy released during the reaction.

The given chemical equation represents a single displacement reaction. This is because one element (Li) displaces another element (H) in a compound (Hd₂O5) to form a new compound (Li₂O) and free element (Hd) along with the release of energy.

To measure the amount of energy released during the reaction, we can use a calorimeter. A calorimeter is a device that measures the heat change in a chemical reaction.

It consists of an insulated container that holds the reactants and a thermometer to measure the temperature change.

The heat released or absorbed during the reaction causes a change in temperature, which can be measured and used to calculate the energy released or absorbed by the reaction.
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As given on the STEPS Engineers Ireland website ( Engineers Week, Secondary School section) how many free engineering activities are available to download by teachers for classroom use?

Answers

Answer-

According to the Engineers Ireland website, there are 10 free engineering activities available to download by teachers for classroom use in the Secondary School section of Engineers Week.

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Which of these vectors can be written as a linear combination of vector[-6,-4,7,1] and [-4,-3,2,-1]?

Answers

in vector D [-2,1,3,0], we can multiply [-6,-4,7,1] by -2 and [-4,-3,2,-1] by 1 and add the two results together to obtain [-2,1,3,0]. This means that vector D can be written as a linear combination of vector [-6,-4,7,1] and [-4,-3,2,-1], making it the correct answer.

We can use the concept of linear combinations to answer this question. A linear combination of two vectors is a vector that can be written as the sum of two or more vectors. To solve this problem, we need to express the four given vectors as a linear combination of vector [-6,-4,7,1] and [-4,-3,2,-1]. We can do this by multiplying each vector element by a scalar and then adding them together. For example, in vector D [-2,1,3,0], we can multiply [-6,-4,7,1] by -2 and [-4,-3,2,-1] by 1 and add the two results together to obtain [-2,1,3,0]. This means that vector D can be written as a linear combination of vector [-6,-4,7,1] and [-4,-3,2,-1], making it the correct answer.

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House Loan
Cost: $450,000
Length of Loan: 30 Years
Simple Interest Rate: 6.00%
Yearly Taxes: $2,000
Yearly Insurance: $1,500
What are your Monthly Payments with taxes & insurance:

Answers

Answer:

M = P [ i(1 + i)^n ] / [ (1 + i)^n - 1]

where M is the monthly payment, P is the principal (the cost of the house minus the down payment), i is the monthly interest rate (6.00% divided by 12), and n is the total number of payments (30 years times 12 months per year).

Plugging in the values, we get:

P = $450,000 - 0 (assuming no down payment)

i = 0.06 / 12 = 0.005

n = 30 x 12 = 360

M = $450,000 [ 0.005(1 + 0.005)^360 ] / [ (1 + 0.005)^360 - 1] = $2,695.55

So the monthly mortgage payment is $2,695.55.

To find the monthly payment with taxes and insurance, we need to add the yearly taxes and insurance and divide by 12 to get the monthly amounts. So:

Monthly Taxes = $2,000 / 12 = $166.67

Monthly Insurance = $1,500 / 12 = $125.00

Total Monthly Payment with Taxes and Insurance = $2,695.55 + $166.67 + $125.00 = $2,987.22

Therefore, the monthly payments with taxes and insurance for the $450,000 house loan are $2,987.22.

Calculate how far a ball would be hit if it was hit at an angle of 25° and a velocity of 80 mph.

Answers

The distance that the ball was hit, considering that it was hit at an angle of 25° and a velocity of 80 mph, is given as follows:

d = 99.7 meters.

How to obtain the distance that the ball was hit?

First we must obtain the time that the ball was in the air, and the equation is given as follows:

t = 2vy/g.

In which:

vy is the y-component of the velocity.g is the gravity.

The y-component of the velocity is given as follows:

vy = vsin(y)

vy = 35.71 x sine of 25 degrees. (35.71 m/s = 80 mph)

vy = 15.1 m/s.

As the gravity is of 9.81 m/s², the time is given as follows:

t = 2 x 15.1/9.81

t = 3.08 s.

The distance is then given as follows:

d = Vxt.

d = 35.71 x cosine of 25 degrees x 3.08

d = 99.7 meters

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Examine the solution process below. If it is correct, select "The solution is correct." If incorrect, select the first equation in the solution process that is not true, Osuming that the prior equation is true. ► x + 4 = 2x + 11 3x + 4 = 11 3x = 15 x = 5 The solution is correct.​

Answers

Answer: Yes the soultuion is corrrect

Step-by-step explanation:

a company has two large computers. the slower computer can send all the companys email in 30 minutes. the faster computer can complete the same job in 20 minutes. if both computers work together, how long will it take them to do the same job?

Answers

If both computers work together it will take them 12 minutes to do the same job.

We will be using the given formula :

Time = (W) / (V1 + V2), where W is the amount of work to be done, and V1 and V2 are the efficiencies of two workers.

Let the amount of work to be done be 1 (all the email sent).

The efficiency of the slower computer is 1/30.

The efficiency of the faster computer is 1/20.

When both computers work together, the efficiency of the slower computer and the efficiency of the faster computer are added, so their efficiency is 1/30 + 1/20 = 1/12.

Substituting the values in the formula, we have :

Time = (W) / (V1 + V2)

Time = (1 ) / (1/30 + 1/20)

Time = (1) / 1/12

Time = 12 minutes

Therefore, if both computers work together, it will take them 12 minutes to do the same job.

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Traditionally, authors of textbooks on tests and measurements have suggested that, at a minimum, a test should have a test-retest reliability of .70 to be considered sufficiently reliable to use for the assessment of individuals. Using this criterion when evaluating the test-retest reliability coefficients for middle adolescents, which variables measured by the test are sufficiently reliable?

Answers

Based on the given criterion, the variables that are sufficiently reliable for middle adolescents are creativity, critical thinking, and cognitive ability

Traditionally, authors of textbooks on tests and measurements have suggested that, at a minimum, a test should have a test-retest reliability of .70 to be considered sufficiently reliable to use for the assessment of individuals. Using this criterion when evaluating the test-retest reliability coefficients for middle adolescents, the variables measured by the test that are sufficiently reliable are as follows:In this scenario, the variables measured by the test, which are sufficiently reliable for middle adolescents, can be determined by identifying the variables whose test-retest reliability coefficients are greater than or equal to 0.70. It can be observed that variables such as creativity, critical thinking, and cognitive ability are all variables that are considered reliable for middle adolescents. Therefore, based on the given criterion, the variables that are sufficiently reliable for middle adolescents are creativity, critical thinking, and cognitive ability.A reliability coefficient is a statistical method used to assess the reliability of a measurement by determining the consistency of scores obtained by the measurement instrument. A test-retest reliability is a statistical method used to determine the reliability of a test's measurements by comparing the scores obtained from taking the same test multiple times over a period of time. The coefficient of test-retest reliability measures the consistency of test scores over time, indicating whether a test is stable and reliable enough to be used as an assessment tool.

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A rectangle has a width of 3 cm and a length of 10 cm. what is the effect on the perimeter when the dimensions are multiplied by 10? responses the perimeter is increased by a factor of 10. the perimeter is increased by a factor of 10. the perimeter is increased by a factor of 40. the perimeter is increased by a factor of 40. the perimeter is increased by a factor of 100. the perimeter is increased by a factor of 100. the perimeter is increased by a factor of 400.

Answers

The perimeter of a rectangle is given by the formula P = 2(l+w), where l is the length and w is the width of the rectangle. The correct answer is that the perimeter is increased by a factor of 10.

In this case, the width is 3 cm and the length is 10 cm, so the initial perimeter is:

P = 2(10+3) = 26 cm

Now, if we multiply the dimensions by 10, the new length would be 10 x 10 = 100 cm and the new width would be 3 x 10 = 30 cm. The new perimeter would then be:

P' = 2(100+30) = 260 cm

Comparing the initial perimeter to the new perimeter, we can see that the new perimeter is 260/26 = 10 times larger than the initial perimeter. Therefore, the correct answer is that the perimeter is increased by a factor of 10

It's important to note that the word "factor" is often used to describe the degree to which something changes. In this case, a factor of 10 means that the new perimeter is 10 times larger than the initial perimeter. If we were to use the word "increase" instead, we would say that the perimeter is increased by 250% (or 2.5 times).

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what is the length of sides 1 and 2 of the triangles show work

Answers

The length of the side 1 and side 2 of the triangle shown is determined as 2x² + 4.

What is the length of side 1 and side 2 of the triangle?

The length of side 1 and side 2 is calculated by adding the respective together as shown below.

side 1 + side 2 = ( 3x² - 4x - 1 ) +  ( 4x - x² + 5 )

To add these two expressions, we need to combine like terms.

First, let's write the expressions in descending order of degree:

( 3x² - 4x - 1 ) + ( 4x - x² + 5 )

= 3x² - x² - 4x + 4x - 1 + 5 (grouping like terms)

= 2x² + 4 (combining like terms)

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The order of 105cm 1m 150mm from biggest to smallest

Answers

The order of the given numbers with different units of length from biggest to smallest is given by 105cm > 1m > 150mm.

Measurement with different units are,

105cm

1m

150mm

To arrange these measurements in order from biggest to smallest,

Convert all the measurements in the same units.

Convert all of them to meters,

1 meter = 100 centimeter

To convert centimeter to meter divide it by 100 we get,

105 cm

= 105 / 100 m

= 1.05 m

And 1 m = 1 m

1 meter = 100 centimeter

1 centimeter = 10millimeter

⇒ 1meter = 1000 millimeter

To convert millimeter to meter divide it by 1000 we get,

150 mm

= 150 / 1000 m

= 0.15 m

Now, arrange them in order from biggest to smallest we get,

1.05 m, 1 m, 0.15 m

1.05 m > 1 m > 0.15 m

⇒ 105cm > 1m > 150mm

Therefore, the order of the given numbers from biggest to smallest is equal to 105cm > 1m > 150mm.

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1. (20 marks) A survey database shows that 20 percent of the adults in country A have been tested for HIV at some point in their life. (a) Suppose that an adult who has been tested for HIV at some point in his life is needed in a study. Some adults are randomly selected from the population of country A in the selection process until the one who has been tested for HIV is found. Let X be the number of adults selected in this process. Show that the cumulative probability P(X≤x)=1−0.8 x . (4 marks) (b) Using the formula of P(X≤x) in (a), find the probability that the number of adults selected in the process are: (i) Three, (ii) Less than five, (iii) Between five and nine, inclusive, (iv) More than five, but less than 10, (v) Six or more. (5 marks) (c) Find the mean and variance of the number of people selected in the above process. (3 marks) (d) Consider a simple random sample of 18 adults. Find the probability that the number of adults who have been tested for HIV in the sample would be: (i) Three, (ii) Less than five, (iii) Between five and nine, inclusive, (iv) More than five, but less than 10 , (v) Six or more. ( 5 marks) (e) Find the mean and variance of the number of people tested for HIV in the sample. (3 marks)

Answers

From the given data provided, the probability that number of adults selected in process are 3, less than 5, between 5 and 9, more than 5 but less than 10, 6 or more is 0.096, 0.41, 0.336, 0.232, 0.168 and mean of number of people tested for HIV is 3.6.

(a) The probability that an adult has not been tested for HIV is 1-0.20=0.80. Therefore, the probability that the first adult selected has not been tested for HIV is 0.80. The probability that the first and second adults selected have not been tested for HIV is 0.80 x 0.80=0.64. Continuing in this way, we see that the probability that X adults must be selected until one who has been tested for HIV is found is given by:

P(X≤x) = 1 - 0.80ˣ

(b) Using the formula from (a), we can find the probabilities as follows:

(i) P(X=3) = P(X≤3) - P(X≤2) = (1-0.80³) - (1-0.80²) = 0.096

(ii) P(X<5) = P(X≤4) = 1-0.80⁴ = 0.41

(iii) P(5≤X≤9) = P(X≤9) - P(X≤4) = (1-0.80⁹) - (1-0.80⁴) = 0.336

(iv) P(6≤X<10) = P(X≤9) - P(X≤5) = (1-0.80⁹) - (1-0.80⁵) = 0.232

(v) P(X≥6) = 1 - P(X≤5) = 1 - (1-0.80⁵) = 0.168

(c) To find the mean and variance of X, we first note that X follows a geometric distribution with parameter p=0.20. Therefore, the mean and variance of X are:

Mean of X = E(X) = 1/p = 1/0.20 = 5

Variance of X = Var(X) = (1-p)/p² = 0.8/0.04 = 20

(d) To find the probabilities for a random sample of 18 adults, we use the binomial distribution with parameters n=18 and p=0.20. The probabilities are:

(i) P(X=3) = (18 choose 3) x 0.20³ x 0.80¹⁵ = 0.236

(ii) P(X<5) = P(X≤4) = Σ(18 choose x) x 0.20ˣ x 0.80⁽¹⁸⁻ˣ⁾ for x=0 to 4 = 0.678

(iii) P(5≤X≤9) = Σ(18 choose x) x 0.20ˣ x 0.80⁽¹⁸⁻ˣ⁾ for x=5 to 9 = 0.286

(iv) P(6≤X<10) = Σ(18 choose x) x 0.20ˣ x 0.80⁽¹⁸⁻ˣ⁾ for x=6 to 9 = 0.207

(v) P(X≥6) = 1 - P(X≤5) = 1 - Σ(18 choose x) x 0.20ˣ x 0.80⁽¹⁸⁻ˣ⁾ for x=0 to 5 = 0.322

(e) The mean and variance of X for a sample of 18 adults are:

Mean of X = E(X) = n x p = 18 x 0.20 = 3.6

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Find the value of x in the regular octagon when each angle is represented by the expression (8x+23)°

Answers

The value of x in the regular octagon is 14°. The solution has been obtained by using arithmetic operations.

What are arithmetic operations?

All real numbers are claimed to be able to be described by the four basic operations, sometimes known as "arithmetic operations". Quotient, product, sum, and difference are the next four mathematical operations after division, multiplication, addition, and subtraction.

We are given that the measure of each angle is (8x + 23)°.

We know that the sum of angles of an octagon is 1080°.

So, using the arithmetic operation, we get

⇒ 8 * (8x + 23)° = 1080°

⇒ 64x + 184 = 1080°

⇒ 64x = 896°

⇒ x = 14°

Hence, the value of x in the regular octagon is 14°.

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2. If twice a number is decreased by 13, the result is 9. What is the number?

Answers

Answer:

Let's start by translating the sentence into an equation using algebra.

Let's say the number is represented by "x".

According to the problem:

"Twice a number" can be written as "2x".

"If twice a number is decreased by 13" can be written as "2x - 13".

"The result is 9" can be written as "= 9".

Putting it all together, we get the equation:

2x - 13 = 9

Now we can solve for x:

2x = 22

x = 11

Therefore, the number is 11.

The external radius of hollow right circular cylindrical pipe is 9cm and it's length is 14 cm. If the volume of metal used make the pipe is 748cm^3then find thickness of metal

Answers

The thickness of a hollow cylinder which is also the thickness of the metal is 1cm

How to calculate the Thickness of a hollow cylinder.

To calculate the thickness of a hollow cylinder, subtract the inner and outer cylinder radii, r and R:

the thickness of the solid is:t = R - r

And if we are working with the diameter, we subtract the diameters and divide by 2VH = π × h(D² - d²)/4

where

Vh = Volume of hollow cylinder = 748cm  

h = height of cylinder = 14cm

D = external diameter = 9 x 2 = 18cm

d = internal diameter = ??

The above statements can then be represented as:

4 x 748 = 22/7 x 14 (18² - d²)

Evaluate the products, quotients and exponents

68 = 324 - d²

So, we have

d² = 256

Take the square roots

d = 16 cm

From here we can get the thickness by subtracting the external and internal diameter and dividing by 2

thickness = (18 - 16)/2

thickness = 2/2

thickness = 1cm

So, the thickness is 1 cm

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suppose you are in charge of a company that rents moving vans to customers. Each van costs $18,000, and you spend an average of $35 per rental day on maintenance costs. You rent the van for $59.99 per day. How could you set up a system of equations to find where your company "breaks even?" On average, how many days must one van be rented before the company makes any profit

Answers

The answer will be as follows after answering the supplied question After  equation reaching the break-even threshold, the firm will begin to profit.

What is equation?

A math equation is a process that relates two statements by using the equals sign (=) to indicate equivalence. In algebra, an equation is a mathematical statement that shows the equivalence of two mathematical expressions. In the equation 3x + 5 = 14, for example, the equal sign separates the numbers 3x + 5 and 14. A mathematical formula may be used to understand the link between the two phrases written on opposite sides of a letter. Frequently, the logo and the software are the same. For example, 2x - 4 = 2.

Rental rate per day x number of rental days Equals total revenue

Total revenue = $59.99 multiplied by

Total cost = vehicle cost + daily maintenance cost * number of rental days

Total expenditure = $18,000 + $35x

We can now put these two equations equal to determine the break-even point:

$59.99x = $18,000 + $35x

When we solve for x, we get:

$24.99x = $18,000

x = 720.29

We round up to 721 days since we can't rent a vehicle for a fractional amount of days.

As a result, in order to break even, the corporation needs rent a vehicle for at least 721 days.

After reaching the break-even threshold, the firm will begin to profit.

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If $4000 is invested at 7% interest per year compounded continuously, how long will it take to double the original investment?

Answers

it will take about 9.90 years to double the initial investment of $4000 at 7% continuous compound interest.

We can use the formula for continuous compound interest:

[tex]A = Pe^(rt)[/tex]

where A is the amount of money after time t, P is the principal (initial investment), r is the interest rate, and e is the mathematical constant approximately equal to 2.71828.

To find the time it takes to double the initial investment, we want to solve for t when A = 2P (twice the initial investment). Substituting the given values, we have:

[tex]2P = Pe^(rt)[/tex]

Dividing both sides by P, we get:

[tex]2 = e^(rt)[/tex]

Taking the natural logarithm (ln) of both sides, we have:

[tex]ln(2) = ln(e^(rt))[/tex]

ln(2) = rt * ln(e)

Since ln(e) = 1, we can simplify further to:

ln(2) = rt

Solving for t, we get:

t = ln(2) / r

Substituting the given values, we have:

t = ln(2) / 0.07

t ≈ 9.90 years

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Jaqi owes Katie$60and pays$35toward her debt. a. What percent of the debt has she paid? b. What percent is still owed? c. What is her debt now? d. If Jaqi pays Katie another$10toward her new debt, what pereent of her new debt is paid off?

Answers

a. Jaqi has paid 58.33% οf her debt.

b. Jaqi still οwes 41.67% οf her debt.

c. Jaqi's debt nοw is $25.

d. Jaqi wοuld have paid οff 40% οf her new debt.

What is a percentage?

Percentage can be calculated by dividing the value by the tοtal value, and then multiplying the result by 100.

a. Tο find the percentage οf the debt that Jaqi has paid, we need tο divide the amοunt paid by the tοtal amοunt οwed and multiply by 100:

Percentage paid = (Amοunt paid / Tοtal amοunt οwed) x 100%

Percentage paid = (35 / 60) x 100%

Percentage paid = 58.33%

Sο Jaqi has paid 58.33% οf her debt.

b. Tο find the percentage still οwed, we can subtract the amοunt paid frοm the tοtal amοunt οwed, and then calculate the percentage:

Percentage still οwed = (Amοunt still οwed / Tοtal amοunt οwed) x 100%

Percentage still οwed = ((60 - 35) / 60) x 100%

Percentage still οwed = 41.67%

Sο Jaqi still οwes 41.67% οf her debt.

c. Tο find Jaqi's debt nοw, we simply subtract the amοunt paid frοm the οriginal debt:

Debt nοw = Tοtal amοunt οwed - Amοunt paid

Debt nοw = 60 - 35

Debt nοw = $25

Sο Jaqi's debt nοw is $25.

d. If Jaqi pays anοther $10 tοward her new debt οf $25, we can find the percentage paid as fοllοws:

Percentage paid = (Amοunt paid / Tοtal amοunt οwed) x 100%

Percentage paid = (10 / 25) x 100%

Percentage paid = 40%

Sο Jaqi wοuld have paid οff 40% οf her new debt.

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