Derek is selecting a sock from his drawer. He chooses a sock at random and then selects a second sock at random. What is the probability that Derek selected a striped sock both times

The three elements of the fire triangle are heat, fuel, and oxygen.

All three elements are present in various locations such as kitchens, factories, workshops, and even in nature such as forests and grasslands. For example, in a kitchen, the stove provides heat, cooking oil or gas is the fuel, and air provides oxygen.

In a factory, welding machines generate heat, combustible materials serve as fuel, and air provides oxygen. In a forest, the hot summer sun provides heat, dry leaves and branches serve as fuel, and air provides oxygen. Whenever all three elements are present, there is an increased risk of fire, and proper precautions should be taken to prevent fires from starting.

For example, if there is a dry and combustible material (fuel) that is exposed to a high temperature or a spark (heat), and there is an ample supply of oxygen in the air, then all three elements of the fire triangle are present and a fire can start. Another example might be a gas stove with an open flame (heat), a can of flammable cooking oil (fuel), and a well-ventilated kitchen (oxygen).

When these three elements are present together, there is an increased risk of fire.

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In an independent groups experiment, if you must estimate the population standard deviation to determine the significance of the sample results, the appropriate inference test is an F-test or the F-distribution, Welch's t-test.

Explanation:

The F-test is used to compare the variances of two or more groups. In the context of an independent groups experiment, where two or more groups are being compared, the F-test can be used to estimate the population standard deviation by comparing the variances of the samples from each group.

To conduct an F-test, the variances of the samples from each group are calculated, and the ratio of the largest sample variance to the smallest sample variance is computed. This ratio follows an F-distribution, which is a continuous probability distribution with two degrees of freedom: one for the numerator (largest sample variance) and one for the denominator (smallest sample variance). The F-distribution is used to determine whether the observed ratio of sample variances is statistically significant or not.

If the F-test results in a statistically significant ratio of sample variances, it indicates that the population standard deviations are likely to be different. In this case, the appropriate inference test would be a test that takes into account unequal population standard deviations, such as Welch's t-test, which is a modified version of the independent samples t-test that accounts for unequal variances. Welch's t-test is commonly used when the assumption of equal variances is violated in an independent groups experiment, and the population standard deviations cannot be assumed to be equal.

In summary, the appropriate inference test for estimating the population standard deviation in an independent groups experiment is the F-test or the F-distribution. If the F-test results in statistically significant differences in sample variances, then a modified version of the t-test, such as Welch's t-test, should be used to determine the significance of the sample results.

Therefore, the appropriate inference test for estimating the population standard deviation in an independent groups experiment is the F-test or the F-distribution.

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The vertices of the parallelogram are (0,0), (5,2), (6,4), and (11,6). We can use the distance formula to find the lengths of the sides of the parallelogram:

The distance between (0,0) and (5,2) is √(5^2 + 2^2) = √29.

The distance between (5,2) and (6,4) is √(1^2 + 2^2) = √5.

The distance between (6,4) and (11,6) is √(5^2 + 2^2) = √29.

The distance between (11,6) and (0,0) is √(11^2 + 6^2) = √157.

Since opposite sides of a parallelogram are congruent, the lengths of the opposite sides are equal. So the area of the parallelogram is the product of the length of one pair of opposite sides and the height, which is the perpendicular distance between the parallel sides. We can find the height by drawing a line perpendicular to one of the parallel sides and finding its length using the Pythagorean theorem. For example, we can draw a line from (0,0) perpendicular to the side connecting (5,2) and (6,4):

The slope of the side connecting (5,2) and (6,4) is (4-2)/(6-5) = 2.

The slope of a line perpendicular to this side is -1/2.

The equation of the line perpendicular to this side passing through (0,0) is y = (-1/2)x.

The x-coordinate of the point where this line intersects the side connecting (5,2) and (6,4) can be found by setting y = 2 in the equation y = (-1/2)x. Solving for x, we get x = -4.

The length of the line from (0,0) to the point (-4,2) is √((-4-0)^2 + (2-0)^2) = 2√5.

So the area of the parallelogram is (length of one pair of opposite sides) x (height) = √29 x 2√5 = 2√145.

Therefore, the area of the parallelogram is 2√145 square units.

The vertices of the parallelogram are (0,0), (-2,4), (6,-5), and (4,-1). We can use the distance formula to find the lengths of the sides of the parallelogram:

The distance between (0,0) and (-2,4) is √((-2-0)^2 + (4-0)^2) = √20.

The distance between (-2,4) and (6,-5) is √((6-(-2))^2 + (-5-4)^2) = √185.

The distance between (6,-5) and (4,-1) is √((4-6)^2 + (-1-(-5))^2) = √20.

The distance between (4,-1) and (0,0) is √((0-4)^2 + (-1-0)^2) = 2√17.

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There are 183183 ways to form a committee with six members if it must have more women than men.

We need to find the number of ways to form a committee with six members, having more women than men.

We can achieve this in three possible scenarios:

To form a committee with more women than men, we can have either 1, 2, or 3 men on the committee.

We need to calculate the number of ways to form a committee in each of these cases and add them up to get the total number of ways.

Case 1: 1 man and 5 women

We can choose 1 man out of 11 and 5 women out of 15.

The number of ways to do this is:

11C1 * 15C5 = 11 * 3003 = 33033.

Case 2: 2 men and 4 women

We can choose 2 men out of 11 and 4 women out of 15.

The number of ways to do this is:

11C2 * 15C4 = 55 * 1365 = 75075

Case 3: 3 men and 3 women

We can choose 3 men out of 11 and 3 women out of 15.

The number of ways to do this is:

11C3 * 15C3 = 165 * 455 = 75075

Total number of ways = 33033 + 75075 + 75075 = 183183
This gives you the total number of ways to form a committee with six members, with more women than men.

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7 seconds after inflation has begun, the volume of the balloon is increasing at a rate of approximately 2079.68 cubic inches per second.

The formula for the volume of a sphere is V = (4/3)πr^3. Since the radius of the spherical balloon is increasing at a constant rate of 1.5 inches per second, we can find the rate of change of the volume with respect to time by taking the derivative of the volume formula with respect to time:

dV/dt = 4πr^2(dr/dt)

At t = 7 seconds, we know that dr/dt = 1.5 inches per second, and we can find r by using the fact that the balloon is being inflated, so r = 1.5t = 1.5(7) = 10.5 inches. Substituting these values into the equation above, we get:

dV/dt = 4π(10.5)^2(1.5) = 2209.4π cubic inches per second

Therefore, the rate at which the volume of the balloon is increasing 7 seconds after inflation has begun is approximately 2209.4π cubic inches per second.

To find the rate at which the volume of the balloon is increasing 7 seconds after inflation has begun, we will use the given information and the formula for the volume of a sphere.

1. The formula for the volume of a sphere is V = (4/3)πr³, where V is the volume and r is the radius.

2. The radius of the balloon is increasing at a constant rate of 1.5 inches per second. This means that dr/dt = 1.5 inches per second (the rate of change of the radius with respect to time).

3. We need to find dV/dt, the rate of change of the volume with respect to time, at t = 7 seconds.

4. First, we need to find the radius of the balloon at t = 7 seconds. Since the radius is increasing at a rate of 1.5 inches per second, after 7 seconds, the radius will have increased by 1.5 * 7 = 10.5 inches.

5. Now we will differentiate the volume formula with respect to time: dV/dt = d/dt[(4/3)πr³]. Using the chain rule, we get dV/dt = (4πr²)(dr/dt).

6. We know the radius at t = 7 seconds is 10.5 inches and dr/dt = 1.5 inches per second. Plug these values into the equation: dV/dt = (4π(10.5)²)(1.5).

7. Calculate dV/dt: dV/dt ≈ 2079.68 cubic inches per second.

So, 7 seconds after inflation has begun, the volume of the balloon is increasing at a rate of approximately 2079.68 cubic inches per second.

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The amount of chlorine in the pool at the start of any given week, we need to know the amount of chlorine in the pool at the start of the previous week.

Let Cn be the amount of chlorine in the pool at the start of the nth week.

We can start by finding the amount of chlorine in the pool at the start of the second week. Since 40% of the chlorine evaporates, we have:

C2 = 0.6(C1 + 16)

Now, we can use this formula to find the amount of chlorine in the pool at the start of the third week:

C3 = 0.6(C2 + 16)

We can continue this process to find a recursive rule for Cn:

Cn = 0.6(Cn-1 + 16)

where C1 = 34.

This formula tells us that to find the amount of chlorine in the pool at the start of any given week, we need to know the amount of chlorine in the pool at the start of the previous week. We can use this formula repeatedly to find the amount of chlorine in the pool at the start of any week.

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In an independent-measures design experiment with two treatment conditions and 22 scores in each condition, a total of 44 subjects participated in the experiment.

To determine the number of subjects who participated in the experiment with an independent-measures design and 22 scores in each treatment condition, you simply need to add the number of scores in each condition together.

A researcher conducts an experiment comparing two treatment conditions with 22 scores in each treatment condition. If the researcher used an independent-measures design, how many subjects participated in the experiment are as follows:

Step 1: Identify the number of scores in each treatment condition.
There are 22 scores in each of the two treatment conditions.

Step 2: Add the number of scores in both treatment conditions together.
22 scores (from treatment condition 1) + 22 scores (from treatment condition 2) = 44 scores

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The greatest distance a person could be from the sprinkler and still get sprayed by it is 28 feet, which is equal to the diameter of the circle described by the equation (x+6)²+(y−9)²=196.

In this problem, we are given an equation that describes the area covered by a sprinkler set in the middle of a lawn. Specifically, the equation (x+6)²+(y−9)²=196 represents a circle with center (-6,9).

Radius

= √196

= 14

The greatest distance that a person could be from the sprinkler and still get sprayed by it is equal to the diameter of the circle.

The diameter is simply twice the radius, which is 2 × 14 = 28 feet.

To understand why the diameter is the maximum distance a person could be from the sprinkler and still get sprayed, we can visualize the circle as the area covered by the sprinkler's spray. Any point inside the circle would be sprayed by the sprinkler, while any point outside of the circle would not. Since the diameter is the longest distance between two points on the circle, any point beyond the diameter would be outside the area covered by the sprinkler's spray.

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The percent chance that a person who uses both wrenches moderately often will break both during normal use is 0.1%. This is calculated by multiplying the probabilities of breaking each wrench, which are 5% and 2%, respectively.

To find the percent chance that a person who uses both wrenches moderately often will break both during normal use, we need to use the multiplication rule of probability.

The probability of breaking both wrenches is the product of the probabilities of breaking each wrench.

Let A be the event that the first wrench breaks, and B be the event that the second wrench breaks.

The probability of A is 0.05, and the probability of B is 0.02.

Therefore, the probability of breaking both wrenches is

P(A and B) = P(A) * P(B)

P(A and B) = 0.05 * 0.02

P(A and B) = 0.001

To express this probability as a percentage, we multiply by 100

P(A and B) = 0.001 * 100

P(A and B) = 0.1%

Therefore, there is a 0.1% chance that a person who uses both wrenches moderately often will break both during normal use.

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Thus, the df between subjects is 5. This represents the variation between the individual subjects in the study, which helps in determining if the treatment effects are statistically significant or if the differences are due to random chance.

In a two-factor analysis of variance, the dfbetween subjects refer to the degrees of freedom associated with the differences between the group means. In this particular scenario where there are six subjects who each underwent three treatments, we can calculate the dfbetween subjects for each factor separately.

For the first factor (treatment), we have three levels. Therefore, the dfbetween subjects would be equal to the number of treatments minus one, which is 2.
For the second factor (subjects), we have six subjects. Therefore, the dfbetween subjects would be equal to the number of subjects minus one, which is 5.

To calculate df between subjects, you will use the following formula:

df between subjects = (number of subjects - 1)

In this case, there are six subjects, so the formula becomes:

df between subjects = (6 - 1)

Hence, the df between subjects is 5. This represents the variation between the individual subjects in the study, which helps in determining if the treatment effects are statistically significant or if the differences are due to random chance.

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The manager of a grocery store conducted a study with a sample of 100 customers to determine if the mean waiting time is significantly greater than 3 minutes.

With an average checkout time of 3.1 minutes and a standard deviation of 0.5 minutes, at a 95% confidence level, it can be concluded that the mean of the population is c.

significantly greater than 3, the manager of the grocery store took a random sample of 100 customers and found that the average length of time it took customers in the sample to check out was 3.1 minutes with a standard deviation of 0.5 minutes.

The question asks if we can determine whether or not the mean waiting time of all customers is significantly greater than 3 minutes at a 95% confidence level. we need to conduct a hypothesis test. The null hypothesis is that the population mean waiting time is equal to 3 minutes,

while the alternative hypothesis is that the population mean waiting time is greater than 3 minutes. We can use a one-sample t-test to test this hypothesis. With a sample size of 100, we can assume that the sample is normally distributed. Using a t-distribution with 99 degrees of freedom (n-1), we can calculate the t-statistic as:

t = (X- μ) / (s / √n)
t = (3.1 - 3) / (0.5 / √100)
t = 2

Using a t-table with 99 degrees of freedom and a 95% confidence level, we find that the critical value is 1.984. Since our calculated t-statistic (2) is greater than the critical value (1.984), we can reject the null hypothesis and conclude that the mean waiting time of all customers is significantly greater than 3 minutes. Therefore, the answer is: c. significantly greater than 3.

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Answer:

Answer below.

Step-by-step explanation:

Formula to use:

upper bound of speed = upper bound of distance/lower bound of time

Upper bound of distance = 146.25m

Lower bound of time = 6.5s

Upper bound of speed = 146.25/6.5

= 22.5m/s

Answer:

22.5m/s

Step-by-step explanation:

Answer:

Option (D) Non-probability

Step-by-step explanation:

In Non-probability sampling, there is no way to calculate the likelihood that a specific element of the population being studied will be chosen.

The correct answer is d. nonprobability sampling.

In nonprobability sampling, the selection of elements from the population is not based on a known probability or randomization process. It does not allow for the calculation of the likelihood of a specific element being chosen because the selection is typically based on convenience, judgment, or availability. Nonprobability sampling methods are often used when it is difficult or impractical to obtain a representative sample from the population of interest.

In contrast, probability sampling methods (option b) involve random selection, and each element in the population has a known probability of being included in the sample. Probability sampling allows for the calculation of sampling probabilities and enables the estimation of sampling errors and the generalizability of findings to the population.

The other options (a. census, c. stratified, and e. quota) are not directly related to the described characteristic of not being able to calculate the likelihood of specific element selection.

A census involves studying the entire population, stratified sampling involves dividing the population into subgroups and sampling from each subgroup, and quota sampling involves selecting individuals based on pre-defined characteristics to meet specific quotas.

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Answer:

a)

[tex] \sin(2( \frac{5}{13} )) = 2 \sin( \frac{5}{13} ) \cos( \frac{5}{13} ) [/tex]

b)

[tex] \cos( 2(\frac{5}{13}) ) = { cos }^{2} \frac{5}{13} - {sin}^{2} \frac{5}{13} [/tex]

Step-by-step explanation:

the given speed is

63 cm / 2 days

1 m = 100 cm

therefore, m = cm/100.

so,

63 cm = 0.63 m

1 day = 24 h

therefore,

2 days = 24×2 = 48 h

so, we have a speed of

0.63 m / 48 h

we need to get the speed of meters in 1 hour.

so, we need to do a normal fraction operation.

e.g. when we have 43/10, but we want to have 1 in the denominator (bottom part).

what do we do ? well, we divide top and bottom (to keep the total value of the fraction unchanged) by 10 and get

4.3/1 = 4.3

we do the same with

0.63 m / 48 h

as we want to have only 1 hour in the denominator.

we divide top and bottom by 48 :

0.63/48 / 1 h = 0.013125 m/h ≈ 0.01 m/h

We can say that Gustavo found a higher frequency of defective calculators than what the company claimed was expected.

The company claimed that the probability of a defective calculator was 1% per 1000 calculators. This means that they expected 1% of the calculators to be defective.

So, the predicted frequency of defective calculators in the sample of 1000 calculators would be:

Predicted frequency = 1% of 1000 = 0.01 x 1000 = 10

However, Gustavo found 15 defective calculators out of 1000. This is higher than the predicted frequency of 10 defective calculators.

So, the actual frequency of defective calculators in Gustavo's sample is 15/1000 = 0.015, or 1.5%. This is higher than the expected frequency of 1%.

It's worth noting that the sample size of 1000 calculators is quite large, so it's possible that the actual frequency is closer to the expected frequency than it appears in this particular sample. However, based on this sample, we can say that Gustavo found a higher frequency of defective calculators than what the company claimed was expected.

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Answer:

[tex]2 = ln(x + 9) [/tex]

[tex] {e}^{2} = x + 9[/tex]

[tex]x = {e}^{2} - 9[/tex]

[tex]x = - 1.61[/tex]

Answer:

  133 m²

Step-by-step explanation:

You want to know the area of a parallelogram with base 9.5 m and height 14 m.

The area is given by the formula ...

  A = bh

  A = (9.5 m)(14 m) = 133 m²

The area of the figure is 133 square meters.

__

Additional comment

The slant height (17 m) is irrelevant for finding the area.

<95141404393>

Find the area of the given figure

At first we have to identify the figure. This is a parallelogram.

Given:

To find :

Formula :

Solution:

We know

Area = Base × Height

Substituting the values we get

Area = 14 × 9.5

→ Area = 133 m²

As a supervisor, if some freshmen cadets in your squad are struggling with a particular skill like the "about face,"

A supervisor is a person who oversees the work of others and ensures that tasks are completed efficiently and effectively. They are typically responsible for managing a team of employees and providing guidance and direction to help them achieve their goals.

Supervisors are essential in most industries, including manufacturing, retail, healthcare, education, and many others. They are often responsible for hiring and training new employees, setting performance expectations, and monitoring progress to ensure that goals are met. They may also be responsible for developing work schedules, coordinating team meetings, and handling employee conflicts.

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Answer:

a) 52 beads

b) 8 beads

Step-by-step explanation:

a) First find how many beads fills one inch by dividing 12 by 3.

 Number of beads that fill 1 inch = 12 ÷ 3

                                                      = 4 beads

Now, to find the beads need to fill 13 inches string, multiply 4 and 13.

Number of beads that fill 13 inches = 4 * 13

                                                          = 52 beads

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

b)   Number of beads that fill 1 inch = 4 beads

     Number of beads to be removed = 4 + 4

                                                              = 8 beads

False. The term "undisturbed" refers to the state of the soil or sediment sample before it is collected.

An undisturbed sample is one that has not been altered or disturbed in any way during the sampling process.

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A sample size of 200 must be obtained to be 94% confident that the true mean IQ is within 2 points of the sample mean, assuming a population standard deviation of 15.

To determine the sample size required to be 94% confident that the true mean IQ (µ) is within 2 points of the sample mean, we will use the following terms:
Confidence level (94%)
Margin of error (E) - 2 points
Population standard deviation (σ) - we need this value to calculate the sample size.
Z-score (Z) - the number of standard deviations away from the mean, corresponding to the given confidence level.
Since the standard deviation of the population (σ) is not provided, I will assume a typical value for IQ scores, which is 15.

If you have a different value, you can plug it into the formula.
Steps to determine the sample size (n):
Find the Z-score (Z) corresponding to the 94% confidence level. You can use a Z-score table or calculator. For 94% confidence level, the Z-score is approximately 1.88.
Determine the margin of error (E), which is given as 2 points.
Use the sample size formula:
[tex]n = (Z^2 * \sigma ^2) / E^2[/tex]
[tex]n = (1.88^2 * 15^2) / 2^2[/tex]
  n = (3.5344 * 225) / 4
  n = 797.52 / 4
  n = 199.38.

Round up the value of n to the nearest whole number, as you cannot have a fraction of a sample.

In this case, n = 200.

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The cost of ordering 22 solder-less lugs at the list price less 35% will be $101.20.

Solder-less lugs are priced at $4.25 each, including a 40% discount when purchased in standard packages of 100. To find the original price without the discount, we'll first calculate the price before the 40% discount:

$4.25 / (1 - 0.40) = $4.25 / 0.60 = $7.08 (rounded to 2 decimal places)

Now, if you only need 22 solder-less lugs and are eligible for a 35% discount, we'll calculate the discounted price for each lug:

$7.08 * (1 - 0.35) = $7.08 * 0.65 = $4.60 (rounded to 2 decimal places)

Finally, to find the total cost for 22 solder-less lugs with a 35% discount, we'll multiply the discounted price by the quantity ordered:

$4.60 * 22 = $101.20

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The minimum amount of paint needed for two coats will be 297 square centimeters.

The shape is a combination of the rectangle and the triangle. Then the area of the shape is calculated as,

A = 1/2 x 18 x 9 + 18 x 12

A = 81 + 216

A = 297 square centimeters

Hence, the minimum amount of paint needed for two coats will be 297 square centimeters.

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The statistic p-hat and the parameter p indicate the proportion of successes in a sample and the population, respectively.

Two typical metrics are the population mean and standard deviation. Greek letters, such as (mu) for the mean and (sigma) for the standard deviation, are frequently used in statistics to denote population parameters.

P′ is equal to x / n, where x is the total number of successes and n is the sample size. As a point estimate for the genuine population percentage, the variable p′ represents the sample proportion. P is a parameter that describes a population-related percentage number. For instance, according to the 2010 United States Census, 83.7% of Americans were not classified as Hispanic or Latino.

[tex]p=xn_p = x_n[/tex]

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The described sampling method is an example of random sampling.

The sampling method described in the question is known as simple random sampling, which is a common method of selecting a representative sample from a population.

In this method, each member of the population is assigned a unique number, and a certain number of individuals are selected randomly from the population.

Simple random sampling is a type of probability sampling, which means that each member of the population has an equal chance of being selected for the sample.

This is important because it ensures that the sample is representative of the population as a whole, and reduces the risk of sampling bias.

The process of simple random sampling is straightforward and easy to implement, making it a popular choice for researchers. However, it can be time-consuming and may not be practical for very large populations. In such cases, other sampling methods such as stratified sampling or cluster sampling may be more appropriate.

Overall, simple random sampling is a reliable and effective method of selecting a representative sample from a population, and is widely used in research studies and surveys.

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Answer:

The distance around the circle.

Step-by-step explanation:

Circumference means the outer area of a particular object or the outer border of the object. When we talk about the circle, the total outer round area is the circumference of the circle.
The formula for circle circumference is 2pir

where pi = 3.14 approx  and the r = radius of the circle

Hence, the answer is the distance around the circle.

The value of N when t=4 is: N = 300 + 450 = 750.

To evaluate the solution at the specified value of the independent variable, we need to find the relationship between N and t. Given the information, we have two points: (0, 150) and (1, 300).

Step 1: Calculate the slope (m) between the two points.
m = (N2 - N1) / (t2 - t1) = (300 - 150) / (1 - 0) = 150

Step 2: Use one of the points (e.g., (0, 150)) and the slope to find the equation N = mt + b.
150 = 150 * 0 + b
b = 150

Step 3: Write the equation with the slope and intercept.
N = 150t + 150

Step 4: Evaluate the value of N when the specified value of the independent variable t = 4.
N = 150 * 4 + 150
N = 600 + 150
N = 750

The value of N when t = 4 is 750.

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Thus, there are over 2 trillion ways for Mavis to move each counter to an adjacent square without having any of them end up in the same square.

There are several ways Mavis can move each counter to an adjacent square, but the question is how many ways can she do this without having two counters end up in the same square.

First, let's consider the top row of the board. There are 7 counters, and each counter has two adjacent squares that it can move to.

However, the counter on each end only has one adjacent square to move to. So, the total number of ways to move the counters in the top row without any of them ending up in the same square is:

2 x 2 x 2 x 2 x 2 x 2 x 1 = 64

Now, let's consider the second row. There are also 7 counters in this row, but the two end counters now have two adjacent squares to move to.

However, there is a new constraint: each counter in the second row must move to a square that is not occupied by a counter in the top row.

This means that the first and last counters in the second row each have three possible squares to move to, while the other five counters each have two possible squares to move to.

So, the total number of ways to move the counters in the second row without any of them ending up in the same square is:

3 x 2 x 2 x 2 x 2 x 2 x 3 = 288

We can continue this process for each row, taking into account the constraints of not having any counters end up in the same square and not moving to squares already occupied in the previous row.

In the end, the total number of ways Mavis can move the counters to adjacent squares is the product of the number of ways for each row:

64 x 288 x 288 x 288 x 288 x 288 x 64 = 2,051,717,760,000

So, there are over 2 trillion ways for Mavis to move each counter to an adjacent square without having any of them end up in the same square.

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Answer:

144 degrees

Step-by-step explanation:

To convert radians to degrees, multiply by

180/π, since a full circle is 360° or 2π radians.(4π/5) ⋅180°/ π

Cancel the common factor of π. 4/5 ⋅ 180

Cancel the common factor of 5. 4 ⋅ 36

Multiply 4 by 36.

144

Convert to a decimal. 144°