A sample of 7 adult elephants had an average weight of 12,572 pounds. The standard deviation for the sample was 26 pounds. Find the 95% confidence interval of the population mean for the weights of adult elephants. Assume the variable is normally distributed. Round intermediate answers to at least three decimal places. Round your final answers to the nearest whole number.

Answers

Answer 1

Answer

[tex]CI=(12553<\mu<12591)[/tex]

Explanation

The confidence interval formula is given by

[tex]\begin{gathered} CI=\bar{x}\pm z\frac{s}{\sqrt[]{n}} \\ \text{Where;} \\ CI\text{ is the 95 percent confidence interval} \\ \bar{x}\text{ is the average weight }=12572 \\ z\text{ is the confidence value }=1.96 \\ s\text{ is the sample standard deviation }=26 \\ n\text{ is the sample size }=7 \end{gathered}[/tex]

This implies that

[tex]\begin{gathered} CI=12572\pm1.96(\frac{26}{\sqrt[]{7}}) \\ CI=12572\pm\frac{50.960}{2.646} \\ CI=12572\pm19.259 \\ CI=(12552.741,12591.259) \\ CI=(12553<\mu<12591) \end{gathered}[/tex]

The 95% confidence interval of the population mean for the weights of adult elephants is (12553 < μ < 12591)


Related Questions

find the slope of the line passing through the points (-5,4) and (3,-3)

Answers

P1 = (-5, 4)

P2 = (3, -3)

Formula

[tex]\text{slope = }\frac{(y2\text{ - y1)}}{(x2\text{ - x1)}}[/tex]

Substitution

[tex]\begin{gathered} \text{ slope = }\frac{(-3-4)}{(3\text{ + 5)}} \\ \text{ slope = }\frac{-7}{8} \end{gathered}[/tex]

Result

[tex]\text{ slope = }\frac{-7}{8}[/tex]

LM is the midsegment of Trapeziod RSXY. may you please help me find what LM is?

Answers

Step 1: Problem

Mid-point of a Trapezoid

Step 2: Concept

[tex]LM\text{ = }\frac{RS+\text{ YX}}{2}[/tex]

Step 3: Method

RS = 4.1

YX = 8.2

[tex]\begin{gathered} LM\text{ = }\frac{4.1\text{ + 8.2}}{2} \\ LM\text{ = }\frac{12.3}{2} \\ LM\text{ = 6.15} \end{gathered}[/tex]

Step 4: Final answer

LM = 6.15

$11,335 is invested, part at 9% and the rest at 6%. If the interest earned from the amount invested at 9% exceeds the interest earned from the amount invested at 6% by $865.35, how much is invested at each rate?

Answers

The amount that was invested at 9% is $10303 , and at 6% is $1032  .

In the question ,

it is given that

total amount invested is $11335 .

let the amount invested at 9% be "x" .

so , the interest earned from 9% part is 0.09x

and let the amount invested at 6% be "y" .

the interest earned from 6% part is 0.06y

So , the equation is x + y = 11335   .

x = 11335 - y

Also given that interest earned from 9% amount exceeds the interest earned from 6%  by $865.35   .

So , according to the question

0.09x = 0.06y + 865.35

On substituting  x = 11335 - y in the above equation , we get

0.09(11335 - y) = 0.06y + 865.35

1020.15 - 0.09y = 0.06y + 865.35

0.09y + 0.06y = 1020.15 - 865.35

0.15y = 154.8

y = 154.8/0.15

y = 1032

and x = 11335 - 1032

x = 10303

Therefore , The amount that was invested at 9% is $10303 , and at 6% is $1032  .

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Please help with this problem my son is having problems showing his work an understanding how. Solve x2 – 6x = 16 using the quadratic formula method. Show your work. Then describe the solution.

Answers

Solution

We are given the quadratic equation

[tex]x^2-6x=16[/tex]

We want to solve by using the quadratic formula method

Note: Given a quadratic equation

[tex]ax^2+bx+c=0[/tex]

The formula method is given

[tex]x=\frac{-b\pm\sqrt[]{b^2-4ac}}{2a}[/tex]

From

[tex]\begin{gathered} x^2-6x=16 \\ x^2-6x-16=0 \\ \text{Comparing with the general form of a quadratic equation} \\ a=1 \\ b=-6 \\ c=-16 \end{gathered}[/tex]

Substituting the parameters intot the quadratic formula

and

Therefore,

[tex]x=8,-2[/tex]

an object’s velocity at time t is given by v(t) = –2 sin t. Let s(t) represent the object’s position at time t. If s(0) = 0, then s(t) =

Answers

GIVEN

The function of the object's velocity is given as follows:

[tex]v(t)=-2\sin t[/tex]

Also given:

[tex]s(0)=0[/tex]

SOLUTION

To get the position's function (s(t)), the velocity function needs to be integrated:

[tex]s(t)=\int v(t)dt[/tex]

Therefore:

[tex]\begin{gathered} s(t)=\int(-2\sin t)dt \\ \mathrm{Take\:the\:constant\:out}: \\ s(t)=-2\cdot\int\sin\left(t\right)dt \\ \mathrm{Use\:the\:common\:integral}:\quad \int \sin \left(t\right)dt=-\cos \left(t\right) \\ s(t)=-2\left(-\cos\left(t\right)\right) \\ \mathrm{Simplify}\text{ and add a constant to the solution} \\ s(t)=2\cos\left(t\right)+C \end{gathered}[/tex]

Recall that s(0) = 0. Therefore:

[tex]\begin{gathered} s(0)=2\cos(0)+C=0 \\ \therefore \\ C=-2 \end{gathered}[/tex]

Hence, the position function is:

[tex]s(t)=2\cos t-2[/tex]

The THIRD OPTION is correct.

9b 9a) Use the slope formula to determine the rate of change eq y- and find the y-intercept "5" by substituting the x and y values into y=mx + b

Answers

A) We need to find the rate of change of the function first.

The rate of change or slope of the line is:

[tex]m=\frac{y_2-y_1}{x_2-x_1_{}}[/tex]

Where x and y are the coordinates of a point in line.

In order to calculate the slope we can take the poinst:

x1 = -6, y1 = 4

x2 = -2, y2= 1

Using the formula of above we find that the slope is:

[tex]m=\frac{1-4}{-2-(-6)}=-\frac{3}{4}[/tex]

Now, in order to find the value of y-intercept of the line we can use formula:

[tex]y=m\cdot x+b[/tex]

Which is the function of the line. From the formula of above we don't know the value of b (the y-intercept).

But we know that the formula must be valid for a point in the line. We can find the value of b replacing the coordinates of a point in the line, let's choose: x = -6 and y = 4, so:

[tex]4=\text{ m}\cdot(-6)+b[/tex]

Now we use the value of m of above:

[tex]4=(-\frac{3}{4})\cdot(-6)+b[/tex]

And from the last equation we can see that:

[tex]b=4-\frac{3}{4}\cdot6=4-\frac{9}{2}=\frac{8}{2}-\frac{9}{2}=-\frac{1}{2}[/tex]

So, the equation of the line is:

[tex]y\text{ = -}\frac{\text{3}}{4}\cdot x-\frac{1}{2}[/tex]

And the y-intercept is obtain replacing x = 0, so the y-intercept is: y = -1/2

b) From the stepts of above we already know an equation that represents the function! It is:

[tex]y\text{ = -}\frac{\text{3}}{4}\cdot x-\frac{1}{2}[/tex]

c) Now, we need to use the last equation to find y = n in the table. We know from the table that the value x for that value of y is x = 3, so we replace that value in the equation of the line:

[tex]y\text{ = -}\frac{\text{3}}{4}\cdot3-\frac{1}{2}=-\frac{9}{4}-\frac{1}{2}=-\frac{9}{4}-\frac{2}{4}=-\frac{11}{4}[/tex]

So the value of n is:

[tex]n\text{ = -}\frac{\text{11}}{4}[/tex]

Given that A = {1, 2,2 3} and B = {4, 6}, then find B×A

Answers

The solution for set B × A is {(4, 1), (4, 2), (4, 3), (6, 1), (6, 2), (6, 3)}

Given,

The sets,

A = {1, 2, 3}

B = {4, 6}

We have to find B × A.

Here,

Consider the Cartesian product:

The set of all ordered pairs (x, y) such that x belongs to A and y belongs to B is referred to as the Cartesian Product of sets A and B in mathematics. For instance, the Cartesian Product of A and B is (1, 3), (1, 4), (1, 5), (2, 3), (2, 4), and (2, 5) if A = [1, 2] and B = [3, 4, 5].

The Cartesian product of B × A = {(b, a) | b € B, a € A}

So,

B × A = {4, 6} × {1, 2, 3}

B × A = {(4, 1), (4, 2), (4, 3), (6, 1), (6, 2), (6, 3)}

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Which statement is equivalent to ~p? p: Even numbers are divisible by 2.

Answers

The statement ~p is "Even numbers are not divisible by 2."

Given statement:-

p: Even numbers are divisible by 2.

We have to find ~p for the statement p.

We know that ~p means negation of p.

Hence, we will negate the statement by adding "not" in the statement.

Hence, the statement will become,

Even numbers are not divisible by 2.

Negation of a statement

In logic, negation, also called the logical complement, is an operation that takes a proposition P to another proposition "not P", written ~P or -P.

It is interpreted intuitively as being true when P is false, and false when P is true.

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Which of the following tests should be administered to see if an experimental medicine lowers blood pressure among hypertensive patients? A. two-tailed test OB. right-tailed test OC. alternative test OD. left-tailed test

Answers

We have to select the appropiate test to see if an experimental medicine lowers blood pressure among hypertensive patients.

In this case, we want to test if the mean for the blood pressure after the treatment is significantly lower than the blood pressure mean without treatment.

Then, for the blood pressure to be significantly different it has to be to the left of a critical value.

Then, it is a left-tailed test.

Answer:

Consider the right triangle shown below where a=8.09, b=9.4, and c=12.4. Note that θ and ϕ are measured in radians.What is the value of cos(θ)?cos(θ)= What is the value of sin(θ)?sin(θ)=What is the value of tan(θ)?tan(θ)=  What is the value of θ?θ=

Answers

By definition

[tex]\cos (angle)=\frac{\text{ adjacent side}}{\text{ hipotenuse}}[/tex]

From the picture

[tex]\begin{gathered} \cos (\theta)=\frac{a}{c} \\ \cos (\theta)=\frac{8.09}{12.4} \\ \cos (\theta)=0.65 \end{gathered}[/tex]

By definition

[tex]\sin (angle)=\frac{\text{ opposite side}}{\text{ hipotenuse}}[/tex]

From the picture:

[tex]\begin{gathered} \sin (\theta)=\frac{b}{c} \\ \sin (\theta)=\frac{9.4}{12.4} \\ \sin (\theta)=0.76 \end{gathered}[/tex]

By definition

[tex]\tan (angle)=\frac{\text{ opposite side}}{\text{ adjacent side}}[/tex]

From the picture

[tex]\begin{gathered} \tan (\theta)=\frac{b}{a} \\ \tan (\theta)=\frac{9.4}{8.09} \\ \tan (\theta)=1.16 \end{gathered}[/tex]

Isolating θ from the previous equations:

[tex]\begin{gathered} \theta=\arccos (0.65)=49.46\text{ \degree}\approx49\text{ \degree} \\ \theta=\arcsin (0.76)=49.46\text{ \degree}\approx49\text{ \degree} \\ \theta=\arctan (1.16)=49.24\text{ \degree}\approx49\text{ \degree} \end{gathered}[/tex]

(The difference between the values is caused by rounding errors)

66. WORKER EFFICIENCY An efficiency study of the morning shift at a certain factory indicates that an average worker who arrives on the job at 8:00 A.M. will have assembled f(x) = -x³ + 6x² + 15x television sets x hours later. How many sets will such a worker have assembled by 10:00 A.M.? [Hint: At 10:00 A.M., x = 2.] b. Ilow many sets will such a worker assemble between 9:00 and 10:00 A.M.?​

Answers

Step-by-step explanation:

use differential calculus

will send image. select the expression. that is not equivalent to 10 + 10p

Answers

We have that

[tex]\begin{gathered} 5(10\text{ + p +p) = 5(10 + 2p)} \\ =\text{ 50 + 10p }\ne\text{ 10 + 10 p} \end{gathered}[/tex]

So the answer is the first one.

For Hox)=2x– 9 and 96 = ; « +9), find (10 g)(x) and (gof)(x). Then determine whether (f = 9/8)= (4 * H(X).What is (fog)x)?(10 g)x)=0

Answers

Given the functions;

[tex]\begin{gathered} f(x)=2x-9 \\ g(x)=\frac{1}{2}(x+9) \end{gathered}[/tex]

We want to find the composite functions;

[tex]undefined[/tex]

(2.4 × 10^3) × (3 × 10^n) = 7.2 × 10^9

Answers

Answer:

n = 6

Step-by-step explanation:

(2.4 × 10^3) × (3 × 10^n) = 7.2 × 10^9

First lets solve the parentheses:

(2.4 × 1000) × ( 3 × 10^n)  =  (7.2 × 1000000000)

2.4 × 1000 = 2400 so...

2400 × (3 × 10^n ) = 7200000000

Next lets divide:

7200000000/2400 = 3000000

So now we have...

(3 × 10^n ) = 3000000

Even though we just divided we have to divide again so...

3000000/3 = 1000000

then to get the answer of n we have to figure out how many times to the power of 10 do we get 1000000.

one easy but time consuming way is

dividing it by ten till you get to one and you would get the same answer. You choose to do that way then that works for your.

There are also other way to figure that out but your teacher teaches you an easier way to figure it out.

A French restaurant used 808,870 ounces of cream last year. This year, due to a menu update, it used 90% less. How much cream did the restaurant use this year?

Answers

Answer:

80,887

Step-by-step explanation:

808,870 x (1 - 0.9)

808,870 x 0.1

80,887

If you bought a stock last year for a price of $90 and it is gone down 13% since then how much is the stock worth now to the nearest cent

Answers

The stock worth is $78.3

Given,

Bought a stock last year for a price of $90

And, price gone down is 13%

To find how much is the stock worth?

No, According to the question

Firstly, find the 13% of 90 i.e.,

= 13/100 x90

= $11.7

Stock worth is

= 90 - 11.7

= 78.3

Hence, The stock worth is $78.3

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Picture explains it all

Answers

Answer is 135 degrees

Reason

The question gave you a 90 degree angle.

We know the straight angle would be 180 degrees.

So the second half is another 90 degrees.

Half of that (45) added to 90 = 135 degrees.

Picture attached shows it’s at 45 degrees on the second half or you can assume it’s half of 90.

the figure shows a net for a three-dimensional figure. the net includes three squares.a) what is the three dimension figure. b) what is the surface area of the digure.

Answers

(b).

The area of the figure is equal to the sum of the area of the three squares and 2 triangles.

The area of the square is

[tex]2\operatorname{cm}\times2\operatorname{cm}=4\operatorname{cm}^2[/tex]

The area of the triangle is

[tex]\frac{1}{2}\times1.7\operatorname{cm}\times2\operatorname{cm}=1.7\operatorname{cm}^2[/tex]

Hence, two triangles and three squares have a total area of

[tex](4\operatorname{cm}\times3)+(2\times1.7cm)=15.4\operatorname{cm}^2[/tex]

Triangle ABC is inscribed in the circle with arcs shown. find X and the measures of angle A, angle B, Angle C

Answers

The total circumference of a circle = 360°

Therefore,

[tex]\text{arc AB + arc BC+ arc AC}=360^0[/tex]

Where,

[tex]\begin{gathered} \text{arc AB=(6x+10)}^0 \\ \text{arc BC=(x+15)}^0 \\ \text{arc AC=((8x-40)}^0 \end{gathered}[/tex]

Therefore,

[tex]\begin{gathered} (6x+10)^0+(x+15)^0+(8x-40)^0=360^0 \\ 6x^0+x^0+8x^0+10^0+15^0-40^0=360^0 \\ 15x^0-15^0=360^0 \\ 15x^0=360^0+15^0 \\ 15x^0=375^0 \\ \text{divide both sides by }15 \\ \frac{15x}{15}=\frac{375^0}{15} \\ x=25^0 \end{gathered}[/tex][tex]\begin{gathered} \text{arc AB=(6x+10)}^0=(6\times25+10)^0=150^0+10^0=160^0 \\ \text{arc BC=(x+15)}^0=(25^0+15^0)=40^0 \\ \text{arc AC=(8x-40)}^0=(8\times25^0-40^0)=200^0-40^0=160^0 \end{gathered}[/tex]

To calculate

[tex]\begin{gathered} \angle A,B,\angle C \\ We\text{ will use the theorem,} \\ \text{The measure of an insribed angle in a circle equals half the measure of the intercepting arc} \\ \end{gathered}[/tex][tex]\begin{gathered} \angle A=\frac{arc\text{ BC}}{2} \\ \angle A=\frac{40^0}{2}=20^0 \end{gathered}[/tex][tex]\begin{gathered} \angle B=\frac{arc\text{ AC}}{2} \\ \angle B=\frac{160^0}{2}=80^0 \end{gathered}[/tex][tex]\begin{gathered} \angle C=\frac{arc\text{ AB}}{2} \\ \angle C=\frac{160^0}{2}=80^0 \end{gathered}[/tex]

Hence,

x = 25°

∠ A=20°

∠ B=80°

∠ C=80°

A cookie jar contains 8 oatmeal, 7 peanut butter and 10 sugar cookies. What is theprobability that Ivan will pull a peanut butter cookie from the jar, eats it, then pulls asugar cookie from the jar?A. 17/49B.7/60C. 17/600D. 7/600

Answers

Answer:

B. 7/60

Explanation:

Given;

Number of oatmeal cookies = 8

Number of peanut butter cookies = 7

Number of sugar cookies = 10

Total number of cookies = 8 + 7 + 10 = 25

So the probability of Ivan pulling a peanut butter cookie from the jar can be determined as seen below;

[tex]\begin{gathered} P(\text{peanut butter cookie) }=\frac{\text{ number of peanut butter cookies}}{\text{Total number of cookies}} \\ P(\text{peanut butter cookie) }=\frac{7}{25} \end{gathered}[/tex]

So if Ivan ate the peanut butter cookie he pulled (he did not replace it), it means that the total number of cookies will be 24, so the probability of pulling a sugar cookie from the jar will now be;

[tex]\begin{gathered} P(sugar\text{ cookie) }=\frac{\text{ number of sugar cookies}}{\text{Total number of cookies}} \\ P(sugar\text{ cookie) }=\frac{10}{24}=\frac{5}{12} \end{gathered}[/tex]

So we can determine the probability that Ivan will pull a peanut butter cookie from the jar, eats it, then pulls a sugar cookie from the jar by multiplying the above probabilities;

[tex]P(peanut,sugar)=\frac{7}{25}\times\frac{5}{12}=\frac{7}{5}\times\frac{1}{12}=\frac{7}{60}[/tex]

Therefore, the probability is 7/60

The table below shows the average price of a Miami Marlins baseball ticket between 2006 and 2021.

Answers

By evaluating the equation in x = 2040, we can estimate the price to be $1507.7.

How to evaluate the equation?

To evaluate an algebraic expression, you have to substitute a number for each variable and perform the arithmetic operations. In the example above, the variable x is equal to 6 since 6 + 6 = 12. If we know the value of our variables, we can replace the variables with their values and then evaluate the expression.

Given that,

We know that the equation:

y = 1.83*x - 2225.5

Models the relationship between the year, x, and the average ticket price of a Miami Marlins baseball ticket.

We know that this relationship works for the years 2006 to 2021, but can be used to estimate the price for years after and before that.

if we use x = 2040

we will get

y = 1.83*2040 - 2225.5 = 1507.7

Hence, The price will be 1507.7, in dollars, of a game in the year 2040.

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Which of the following choices are correct ways to name the line in the figure below?

Answers

line VK and line TV

Explanation:

To name the lines, we pick the points on the line.

The points on the line: K, T, and V

We can name the line towars the right or towards the left.

The lines using the points:

line KV or line VK

line TV or line VT

line KT or line TK

The line with two arrows at the end represent a line.

The line with one arrow represent a ray

from the options, the correct ways to name the line in the figure below:

line VK and line TV

KV is a ray not a line

Therefore, the correct ways to name the line in the figure below : line VK and line TV

Find the midpoint of the segment below and enter its coordinates as anordered pair. If necessary, express coordinates as fractions, using the slashmark ( 1 ) for the fraction bar.

Answers

Consider that the coordinates of the mid-point of a line segment is given by the formula,

[tex]\begin{gathered} x=\frac{x_1+x_2}{2} \\ y=\frac{y_1+y_2}{2} \end{gathered}[/tex]

The given diagram represents the line segment between the points (-3,4) and (-6,-1).

So the corresponding mid-point is given by,

[tex]\begin{gathered} x=\frac{-3+(-6)}{2}=\frac{-9}{2} \\ y=\frac{4+(-1)}{2}=\frac{3}{2} \end{gathered}[/tex]

Thus, the mid-point of the given line segment is ( -9/2 , 3/2 ) .

Where do the graph shifted if the function changes from Y=x^2 to Y=(x+h)^2

Answers

The independent variable x is shifted (x + h). This is a value of h units to the right since it is the sum to the variable x.

So, the graph to find where the graph shift, we need to find the difference between these two values:

[tex](x+h)^2-x^2=x^2+2hx+h^2-x^2=2hx+h^2[/tex]

Then, the graph is shifted

[tex]2hx+h^2[/tex]

Karen wants to buy a new car but needs money for the down payment. Her parents agree to lend her money at an annual rate of 4%, charged as simpleInterest. They lend her $8000 for 6 years. She makes no payments except the one at the end of that time.Answer the following questions. If necessary, refer to the list of financial formulas.х5?(a) How much total interest will Karen have to pay?s0(b) What will the total repayment amount be (including Interest)?s[]

Answers

Answer:

a) $1,920

b) $9,920

Explanation:

Step 1. Gather all of the information.

The amount borrowed will be the principal or starting amount P:

[tex]P=8,000[/tex]

The interest rate will be r:

[tex]r=4\text{ percent}[/tex]

We will need the interest rate in decimal form, for that, divide the percentage amount by 100:

[tex]\begin{gathered} r=\frac{4}{100} \\ \downarrow \\ r=0.04 \end{gathered}[/tex]

And the time of the loan is 6 years, this will be the value of t:

[tex]t=6[/tex]

Step 2. To solve part a, we use the following formula to calculate the interest:

[tex]I=p\times r\times t[/tex]

Substituting all of the known values:

[tex]I=8,000\times0.04\times6[/tex]

The result is:

[tex]I=1,920[/tex]

The total interest that Karen will have to pay is $1,920.

Step 3. To solve part b, we need to find the total repayment amount.

To find this, we add the interest and the principal amount:

[tex]T=P+I[/tex]

Where T represents the total amount.

Substituting P and I:

[tex]\begin{gathered} T=8,000+1,920 \\ \downarrow \\ T=9,920 \end{gathered}[/tex]

The total amount she will have to repay is $9,920.

Answer:

a) $1,920

b) $9,920

Evaluate the expression.If x=12, y=8, and z=3x3 + y + z3

Answers

We need to find the value of

[tex]x^3+y+z^3[/tex]

Where x = 12, y = 8, and z = 3

Substitute these values in the expression above

[tex](12)^3+8+(3)^3[/tex]

12^3 = 1728

3^3 = 27

Then

[tex]1728\text{ + 8 + 27 = 1763}[/tex]

The value of the given expression is 1763

At a coffee shop, there is a pot that has a volume of 5.4 L. Find how many cubic centimeters of coffee will completely fill the pot

Answers

Given:

Total volume = 5.4 L.

We know that 1 L is equivalent to 1000 cubic centimetres; hence:

[tex]5.4L\times\frac{1000cm^3}{1L}[/tex]

ANSWER

5400 cm³ of coffee will completely fill the pot

9×2=2×9 what is the property of this problem?

Answers

The property involved is called "commutative property of product"

SInce we are flipping the oerder of the factors and arrive at the same result.

The "flipping is called "commuting" in Math terms.

Please help me solve. I also need help on what ratios to put in the two boxes before the answer. Do I just choose any of them?

Answers

Explanation

By metric conversion

[tex]\begin{gathered} 1\text{ mile =}1.61km \\ 1\text{ hour = 60 mins} \end{gathered}[/tex]

Therefore;

[tex]\frac{57mi}{1hr}\times\frac{1.61}{1}\times\frac{1}{60}=1.5295\frac{km}{\min }[/tex]

Answer:

[tex]\begin{gathered} \text{Box 1= }\frac{\text{1.61}}{1} \\ \text{Box 2=}\frac{1}{60} \\ \text{Box 3=}1.53 \end{gathered}[/tex]

Number of adult tickets sold = Number of child tickets sold =

Answers

Given:

Total ticket = 321

Total collection = $3535

Adult ticket price = $15

Child ticket price = $5

Find-:

(1)

Number of adult tickets sold

(2)

Number of child tickets sold

Explanation-:

Let the number of adult tickets = x

Let the number of child tickets = y

If the total ticket is 321 then,

[tex]x+y=321........................(1)[/tex]

Price for adult ticket is:

[tex]=15x[/tex]

The price for child ticket is:

[tex]=5y[/tex]

total price is $3535 then,

[tex]15x+5y=3535...................(2)[/tex]

From eq(1)

[tex]\begin{gathered} x+y=321 \\ \\ 5x+5y=1605..............(3) \end{gathered}[/tex]

So eq(2) - eq(3) is:

[tex]\begin{gathered} (15x+5y)-(5x+5y)=3535-1605 \\ \\ 15x-5x+5y-5y=1930 \\ \\ 15x-5x=1930 \\ \\ 10x=1930 \\ \\ x=\frac{1930}{10} \\ \\ x=193 \end{gathered}[/tex]

Put the value in eq(1) then,

[tex]\begin{gathered} x+y=321 \\ \\ 193+y=321 \\ \\ y=321-193 \\ \\ y=128 \end{gathered}[/tex]

So,

Number of adult tickets = 193

Number of child tickets = 128

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