the activity of a radioactive isotope is found to decrease by 40% in one week. what are the values of its: a) decay constant, b) half-life, c) mean lifetime?

We can see here that ranking the four math operations in order of importance, we have:

An operation is a function in mathematics that transforms zero or more input values into a clearly defined output value. The operation's arity is determined by the number of operands.

Addition (+) is the most important of the four operations because it is the foundation of all arithmetic. It is used in everyday life for basic calculations such as adding up a grocery bill or calculating the total cost of a purchase with tax. It is also used in more advanced mathematical concepts such as algebra and calculus.

Multiplication (x) is the second most important operation because it is used to find the total number of items in a group or the total area of a shape. It is also used in more advanced mathematical concepts such as solving equations and finding derivatives.

Subtraction (-) is the third most important operation because it is used to find the difference between two numbers. It is also used in more advanced mathematical concepts such as algebra and calculus.

Division (÷) is the least important of the four operations because it is a reverse operation of multiplication, which is more important and more frequently used. It is used to find the number of times one number is contained within another or the size of a group when the total size and number of groups is known.

All four math operations are important and useful in different ways, but the order of importance is based on how frequently they are used and how foundational they are to other mathematical concepts.

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The appropriate way to visualize a list of the eye colors of 120 people is pie chart and dot plot.

A pie chart is a circular statistical graphic in which the slices represent numerical proportions. In a pie chart, the arc length of each slice reflects the amount it stands for.

Pie charts can be used to show percentages of a whole group and show percentages at a particular moment. In contrast to bar graphs and line graphs, pie charts do not show changes over time.

A dot plot, also known as a strip plot or dot chart, is a simple style of data visualization in which data points are shown as dots on a graph with an x- and y-axis.

The things you and your partner choose to eat are a wonderful example.

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The following question may be like this:

What is an appropriate way to visualize a list of the eye colors of 120 people? select all that apply.

Answer:

The dimensions of the rectangular tract of land with a perimeter of 44 kilometers and an area of 120 square kilometers are:

Length = 10 kilometers

Width = 12 kilometers

Explanation: To find the dimensions of a rectangular tract of land when its perimeter and area are known, you can use the formulas:

Perimeter = 2(length + width)

Area = length * width

We know that:

Perimeter = 44 kilometers

Area = 120 square kilometers

So, we can use these values to set up the following equation:

44 = 2(length + width)

And we can solve for length and width.

44 = 2(length + width)

22 = length + width

And now we know that the sum of the length and width of the rectangular tract is 22 kilometers.

Now we have to use the area formula:

Area = length * width

120 = length * width

We can use the value we have for the sum of the length and width to find either the length or the width of the rectangular tract.

For example, we can use the equation:

length = 22 - width

And substitute it into the area equation:

120 = (22 - width) * width

And then we can solve for width:

120 = 22 * width - width^2

width^2 - 22 * width + 120 = 0

We can use the quadratic formula to solve for width.

width = (22 +/- sqrt(22^2 - 4 * 1 * 120))/ 2

So,

width = (22 +/- sqrt(484 - 480))/ 2

width = (22 +/- sqrt(4))/ 2

width = (22 +/- 2)/ 2

width = (24)/ 2

width = 12

So, the width of the rectangular tract is 12 kilometers.

And we can use the equation:

length = 22 - width

to find the length

length = 22 - 12 = 10

So, the dimensions of the rectangular tract of land with a perimeter of 44 kilometers and an area of 120 square kilometers are:

Length = 10 kilometers

Width = 12 kilometers

Answer: 0.455

Step-by-step explanation:

I figured how to get $1? (The unit price?) so I did 4 divided by 8.8

Answer: The unit price is $2.20 per kilogram of apples

Step-by-step explanation:

Divide $8.80 with 4

8.80/4 = 2.20 per kilogram  

1.21 Canadian dollars is equivalent to 1 US dollar

A monetary exchange rate, also known as a foreign exchange rate, is the rate at which one currency can be exchanged for another. Exchange rates are determined by the foreign exchange market and can fluctuate based on supply and demand.

Since an automobile in Toronto sells for 25,500 Canadian dollars and the same car sells in Detroit for 21,000 US dollars.

Thus, 25,500 Canadian dollars equivalent in US dollars will be:

25,500 Canadian dollar /21,000 US dollars  = 1.21

Thus, 1.21 Canadian dollar is equivalent to 1 US dollar dollars

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The number representing the property of tripled a number two times and getting result 819 is equal to 91.

Let us consider a required number be 'x'.

Triple a given number is represented by 3x.

Tripled a tripled number again is expressed as  3 × ( 3x  )

Result of a tripled a tripled number is equal to 819

⇒ 3 × ( 3x  ) = 819

⇒ 9x = 819

Divide both the side by 9 we get,

⇒9x /9 = 819 /9

⇒ x = 91

Therefore, the required number having property of tripled and tripled a number again with result 819 is equal to 91.

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The length of the north side of the house is 2x^2 + 9x - 32

From the question, we have the following parameters that can be used in our computation:

The figure

On the figure, we have

North side = 5x - 4 + x^2 - 23 + x^2 + 4x - 5

Evaluate

North side = 2x^2 + 9x - 32

Here, we have

Length = 2x + 1

Width =  x^2 + 4x - 5

So, we have

Area = (2x + 1) * (x^2 + 4x - 5)

Area = 2x^3 + 8x^2  -10x + x^2 + 4x - 5

Area = 2x^3 + 9x^2 - 6x - 5

Here, we have

Length = 5x - 4

Width =  5x + 4

So, we have

Area = (5x - 4) * (5x + 4)

Area = 25x^2 - 16

From the figure, we have

Dimensjon = 5x - 4 by (2x + 1 + x + 6 - 5x - 4)

Dimensjon = 5x - 4 by - 2x + 3

Hence, the dimension of the bathroom is 5x - 4 by - 2x + 3

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Answer:

4

Step-by-step explanation:

It says 5g is 20. To figure out the value of g, you need to divide 5g by 5, and 20 by 5, which gives the answer of g=4

The ratio of servings to cones is 47:4.

In mathematics, a ratio is a way of comparing two or more values. It is usually represented as a fraction, with the values being separated by a colon (:). For example, if you have 7 apples and 4 oranges, the ratio of apples to oranges would be 7:4. This can also be written as 7/4 or 1.75. Ratios can also be written as a decimal or a percentage. Ratios can be used to compare quantities, sizes, or measurements in different units.

If the ratio of servings to cups is 7:47:47:4, that means for every 7 servings, there are 47 cups.

Since the servings came in either a cup or a cone, but not both, the ratio of servings to cones is the remaining portion of servings that are not accounted for in the ratio of servings to cups.

So, it's 7 servings + 47 cups = 47 servings + 4 cups.

Therefore, the ratio of servings to cones is 47:4.

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Answer:

108,138

Step-by-step explanation:

Hope this helps :)

The coordinates of the point that partitions the segment is given as :  (-3, 21)

To find the coordinates of the point on the directed line segment from (-9, 9) to (7, -7) that partitions the segment into a ratio of 3 to 5, we can use the concept of vector addition.

First, we can represent the directed line segment as a vector, with the initial point (-9, 9) being the tail, and the terminal point (7, -7) being the head. The vector representing the directed line segment is:

V = <7 - (-9), -7 - 9> = <16, -16>

To partition the segment into a ratio of 3 to 5, we can represent the partition point as a scalar multiple of the vector V:

P = (-9, 9) + (3/8)V = (-9, 9) + (3/8)(16, -16)

The scalar multiple 3/8 is used to get the partition point, it's calculated by dividing the desired ratio (3) by the sum of the ratio (3+5)

Then, we can find the x and y coordinates of the point P by applying the scalar multiple to the components of the vector:

P(x, y) = (-9, 9) + (3/8)(16, -16) = (-9, 9) + (3/8)(16, -16) = (-9 + 316/8, 9 - 3-16/8) = (-9 + 6, 9 + 12) = (-3, 21)

So the coordinates of the point on the directed line segment that partitions the segment into a ratio of 3 to 5 are (-3, 21).

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​

Answer:(−3,3)

​

Step-by-step explanation:

Answer:

n = √m

Step-by-step explanation:

Now we have to,

→ find the required value of n.

The equation is,

→ m = n²

Then the value of n will be,

→ m = n²

→ n² = m

→ [ n = √m ]

Hence, the value of n is √m.

Answer:

8) 27.75

10) See down below. May be 1.83 OR 123.75, depending on what your problem says

Step-by-step explanation:

Problem 8)

Let's first take apart [tex]2^{3}[/tex], which will be 8. Now, let's plug that back into the equation real quick:

12 + (8 ÷ [tex]\frac{2}{3}[/tex]) + 3.75

Since dividing a fraction can also be equal to multiplying the reciprocal of that same fraction, ÷ [tex]\frac{2}{3}[/tex] can be re-written as: * [tex]\frac{3}{2}[/tex]

Let's put that into the equation now and solve:

12 + (8 * [tex]\frac{3}{2}[/tex]) + 3.75

= 12 + 12 + 3.75

= 27.75

Problem 10) (I'm unsure if the sign after 80 is ÷ or +, but I'll do equations for both)

(If the sign after 80 is ÷, check these steps on how to solve):

Same methods as problem 8. Let's first break down [tex]4^{2}[/tex], which will be 16. Then, let's set the ÷ [tex]\frac{2}{5}[/tex] to * [tex]\frac{5}{2}[/tex] and solve:

80 ÷ (16 * [tex]\frac{5}{2}[/tex]) + 3.75

= 80 ÷ (40) + 3.75

= [tex]\frac{80}{40+3.75}[/tex]

= 1.82857

(If the sign after 80 is +, check these steps):

80 + (16 * [tex]\frac{5}{2}[/tex]) + 3.75

= 123.75

Answer:

5

Step-by-step explanation:

log(5)5=1

5^2-1 = 5^1 = 5

The speed of the jet in still air is 525miles per hour and the speed of the jet stream is 75miles per hour

speed is defined as the rate of change of distance with time. It is measured in meter per second and it is a scalar quantity. It has other units like miles per hour, kilometers per hour e.t.c

The speed of the jet with jet stream = displacement /time = 1800/3 = 600 miles/hour

The speed of the jet against = distance /time = 1800 / 4 = 450 miles per hour

The speed of the jet in still air will be the average speed of the jet to and fro. = (600+450)/2

= 1050/2

= 525 miles per hour

Therefore the speed of the jet in still air = 525 miles per hour

Also, the the jet stream speed = 525- 450 = 75 miles per hour.

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The dimensions of the new practice court is 45.5 feet by 29.5 feet.

The equations should be completed as 160 = 2W + 2L; W = L - 16

Mathematically, the perimeter of a rectangle can be calculated by using this mathematical expression;

P = 2(L + W) or P = 2L + 2W

Where:

Since the width of the rectangular lot is 16 feet less than the length, we have:

W = L - 16

Substituting the given parameters into the perimeter formula, we have;

160 = 2L + 2W

160 = 2(L - 16) + 2L

160 = 2L - 32 + 2L

160 = 4L - 32

4L = 182

L = 45.5 feet.

For the width, we have:

W = L - 16

W = 45.5 - 16

W = 29.5 feet.

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Answer:

B

Step-by-step explanation:

What you're seeing is a (x,y,z) plane.

At this point, it's just plug and play.

Looking at choice B....

(1) + (2) + (2)(3) = 1 + 2 + 6 which is indeed 9

(2)(1) + (2)(2) + 3(3) = 2 + 4 + 9 which is indeed 15

(1) + (-3) = 1 - 3 which is indeed -2

Answer:

72 miles

Step-by-step explanation:

its obvious

Answer:

I think 3/20 of a chance of putting 3 frosted cookies in bags to sell.

Step-by-step explanation:

Hope it helps! =D

If the price of gas increases by 5% again next week, then the price be approx 10% higher than it was originally because again shows that their is  two times increment of 5%.

Let the price of gas is x.

The price of gas is increased by 5% in a week. So after increment the price of gas = x + x × 5%

After increment the price of gas = x + 5x/100

After increment the price of gas = (100x + 5x)/100

After increment the price of gas = 105x/100

After increment the price of gas = 1.05x

The gas price again increase by 5%.

Now the price of gas after again increment = 105x/100 × 105%

The price of gas after again increment = 105x/100 × 105/100

The price of gas after again increment = 11025x/10000

The price of gas after again increment = 1.1025x

Now we find the total increment in two weeks

Percent Increment = (1.1025x - x)/x × 100

Percent Increment = 0.1025x/x × 100

Percent Increment = 0.1025 × 100

Percent Increment = 10.25%

Then we can say that approx 10% the cost of oil increased then originally.

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The odds of choosing a red and a blue are 6/20 (4/20), or 3/5.

The balls in the bag are unaware of what was drawn the first time because the two choices are separate.

Six of the 20 pebbles in the bag are red. The odds of selecting a red are 6/20.

Four of the 20 pebbles in the bag are blue. Picking a blue one has a 4/20 chance.

Multiplying the odds of each event will yield the likelihood of two independent events.

The likelihood of selecting a red followed by a blue is 6/20 (4/20), or 3/5.

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For Figure 2, Triangles are congruent by SSS (side side side).

What is a triangle?

In Geometry, triangles are the type of polygons, which have three sides and three vertices. This is a two-dimensional figure with three straight sides. A triangle is considered a 3-sided polygon. The sum of all the three angles of a triangle is equal to 180°. The triangle is contained in a single plane. Based on its sides and angle measurement, the triangle has six types.

Based on the sides of a triangle, a triangle is classified into 3 types, namely:

Scalene Triangle – All the sides are of different measures.

Isosceles Triangle – Two sides of a triangle are of the same measure and the remaining side has a different measure.

Equilateral Triangle – All the 3 sides of a triangle are of the same measure.

Based on the angles of a triangle, a triangle is classified into 3 types, namely:

Acute Angle Triangle – All the angles of a triangle is less than 90°.

Obtuse Angle Triangle – One of the angles of a triangle is greater than 90°.

Right Angle Triangle – One of the angles of a triangle is equal to 90°.

Now ,

As in given figure for triangles

2 sides of both are parallel and one is common for both

Hence,

           These are congruent by SSS theorem.

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Answer: 13/20

Step-by-step explanation: First to find the first part, we need to find a common denominator. So we must ask ourselves, which number is a multiple that both 5 and 4 have in common? The answer then would be 20. So, it would look like this:

[tex]\frac{1}{4} = \frac{?}{20}[/tex]

[tex]\frac{2}{5} = \frac{?}{20}[/tex]

So to find what "?" equals for both fractions, we must use this formula:

Amount =  Right denominator / Left denominator (1st part)

So, now we do 20 / 5 and 20 / 4

20 / 5 = 4

20 / 4 = 5

So, the 2nd part is taking the quotient from that and multiplying it by the left numerators. This would look like this:

5 * 1 = 5

4 * 2 = 8

So your "?" should look like this:

[tex]\frac{1}{4} = \frac{5}{20}[/tex]

[tex]\frac{2}{5} = \frac{8}{20}[/tex]

Then, you'd just add! So, 8 + 5 = 13 and 20 + 20 would stay that same ; 20. So your result is [tex]\frac{13}{20}[/tex]

I hope this helped!

The difference in lengths between the hypotenuse and the longest leg of the triangle is 4.

Pythagoras theorem states that for a right angled triangle, the square of the hypotenuse is the sum of the squares of base and altitude.

By Pythagoras Theorem,

Hypotenuse² = (Leg 1)² + (Leg 2)²

(AB)² = (BC)² + (AC)²

c² = 16² + 12²

c² = 256 + 144

c² = 400

c = √400

c = 20

Length of longest leg = 16

Difference = 20 - 16 = 4

Hence 4 is the difference between the length of the hypotenuse and the longest leg.

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The domain of the rational function in this problem is given as follows:

All real values except x = -3, x = 3, x = 4.

The domain of a function is the set composed by all the input values that the function accepts.

The function in this problem is a fraction, meaning that the denominator cannot be zero.

The denominator is given as follows:

x³ - 4x² - 9x + 36.

The roots of the denominator are given as follows:

x = -3, x = 3, x = 4.

Hence the domain is all real values except those, meaning that the second option is the correct option.

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The ratio of the the total amount spent on advertising to the amount spent on its website is 100: 49.

Now, According to the question:

There are 100 pence in one pound. Money can be written as, for example, £5.50, which means five pounds and fifty pence. The decimal point separates the pounds from the pence.

"Information available from the question"

For every pound a company spends on advertising, it spends  £0.49 pence on its website.

Ratio of the the total amount spent on advertising to the amount spent on its website is,

= 1/0.49

[tex]= \frac{1*100}{0.49*100}[/tex]

= 100/49

= 100 : 49

Therefore, the ratio of the the total amount spent on advertising to the amount spent on its website is 100: 49.

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To find the fraction of the states that Jorge's family has visited, we can use the formula:

visited states / total states

In this case, Jorge's family has visited 38 states out of a total of 50 states, so the fraction of states they have visited is:

38 / 50

You can simplify this fraction by dividing both the numerator and denominator by the greatest common divisor of 38 and 50 which is 2, so the fraction is

19/25

So, Jorge's family has visited 19/25 of the states in America.

Jorge's family has visited 19/25 of the states in America.

Any number of equal parts is represented by a fraction, which also represents a portion of a whole. A fraction, such as one-half, eight-fifths, or three-quarters, indicates how many components of a particular size there are when stated in ordinary English.

In this case, Jorge's family has visited 38 states out of a total of 50 states, so the fraction of states they have visited is:

38 / 50

You can simplify this fraction by dividing both the numerator and denominator by the greatest common divisor of 38 and 50 which is 2, so the fraction is

19/25

19 out of the 25 American states have been visited by the Jorge family.

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The slope-intercept form of the linear function is given as follows:

y = 0.8x + 8.

The slope-intercept definition of a linear function is given as follows:

y = mx + b.

In which:

The graph crosses the y-axis at y = 8, hence the intercept b is given as follows:

b = 8.

When x increases by 10, y increases by 8, hence the slope m is given as follows:

m = 8/10

m = 0.8.

Then the function is defined as follows:

y = 0.8x + 8.

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The probability that there exists people who share the same birthday is 0.995.

Considering that all the 365 days are equally likely to be the birthday of a person and all the events that a person has birthday on 'y' are independent of others.

Under the said assumptions, let's say that there are n number of people in the room. If we number the people from 1 to n, then the total number of possibilities of birthdays are (365)^n.

Therefore, the possible combinations that all birthdays are different:

365 * 364 * 363 * .... * (365- n+1)

Thus, the probability that all birthdays are different is:

[tex]\frac{365* 364 * 363* .... (365- n+1)}{365^n}[/tex]

To get the probability of at least two people sharing the same birthday is,

[tex]1- \frac{365* 364 * 363* .... (365- n+1)}{365^n}[/tex]

= 1 - 0.0058

= 0.9942

=0.995

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Emmanuel weighs 150 pounds. about 2 hours will it take him to metabolize one standard drink

Every hour, the body processes one normal drink. If you have 5 standard drinks, your body will take 5 hours to absorb the alcohol.

In general, the liver can digest one ounce of liquor (or one standard drink) in one hour. If you consume more than this amount of alcohol, your system will get saturated, and the excess alcohol will accumulate in your blood and physiological tissues until it can be metabolized.

It takes your liver around an hour to break down the amount of alcohol in a standard alcoholic drink (one beer, one glass of wine, or one shot).

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