Look at the pic plz I need help!!!!!!!

Answer:

The percent change is 60

\(60% \)

Answer: 60% increase

Step-by-step explanation:

Answer:

91

Step-by-step explanation:

The answer is multiply both sides of the equation by 12. Therefore, y/3 × 12=4y while 1/4 × 12=3, then 5×12=60. 4y-3=60.

The answer is multiply both sides of the equation by 12. Therefore, y/3 × 12=4y while 1/4 × 12=3, then 5×12=60. 4y-3=60.Please Mark BRAINLIEST!!! Please

Answer:

multiplied both sides of the equation by 12

Step-by-step explanation:

\(\frac{y}{3} -\frac{1}{4} = 5\\12(\frac{y}{3}-\frac{1}{4}) = 12(5)\\4y-3=60\)

Answer:

y = 45 + 0.15x

Step-by-step explanation:

$45 is the initial cost

0.15 is the cost for each mile

we dont know the miles so miles is x, unknown

Manipulating temperature in a room to study its impact on task performance involves categorizing the various temperature conditions as the "levels" of the variable.

In experimental research, when investigating the influence of temperature on task performance, researchers manipulate and control the temperature to create different conditions or levels. These temperature levels serve as the independent variable in the study. By systematically altering the temperature, researchers can observe and analyze how variations in temperature affect participants' performance on the given tasks. This experimental design allows researchers to identify patterns, trends, and potential causal relationships between temperature and task performance. Understanding the different temperature conditions or levels in such studies helps researchers learn about the nuanced impact of temperature on human performance and potentially inform practical applications in various settings, such as optimizing work environments or designing effective learning spaces.

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Answer:

$0.32

Step-by-step explanation:

First, we need to see how much the combined cost of the 2 items.

So you add the two costs:

1.29+0.39= 1.68

So the 2 items together cost 1.68

But Eric paid 2 dollars, so he should get some change. But how much?

Since he paid 2 dollars, and the items cost 1.68, we can subtract them to get the change he gets back.

$2-$1.68=$0.32

Eric gets 32 cents back

The production rate of the assembly line is 6000 parts per month.The assembly line produces 6000 parts per month, with a weekly production rate of 1500 parts.

To calculate the production rate of the assembly line, we need to consider the number of weeks in a month. Since the plant operates for 4 weeks per month, we can divide the total production by the number of weeks to find the weekly production rate.

Given that the assembly operations are sequential, we can calculate the weekly production rate as follows:

6000 parts/month ÷ 4 weeks/month = 1500 parts/week.

Therefore, the assembly line produces 1500 parts per week.

The assembly line produces 6000 parts per month, with a weekly production rate of 1500 parts. This information can be used for planning and managing production schedules efficiently.

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Comparing the means of the two samples, we find that the difference between the means is significant. Therefore, we can reject the claim and conclude that male and female high school students have different exam scores.

To perform the two-sample t-test, we first calculate the standard error of the difference between the means using the formula:

SE = sqrt((s1^2 / n1) + (s2^2 / n2))

Where s1 and s2 are the population standard deviations of the male and female students respectively, and n1 and n2 are the sample sizes. Plugging in the values, we have:

SE = sqrt((47^2 / 49) + (4.3^2 / 53))

Next, we calculate the t-statistic using the formula:

t = (x1 - x2) / SE

Where x1 and x2 are the sample means. Plugging in the values, we have:

t = (239 - 21.1) / SE

We can then compare the t-value to the critical t-value at α = 0.01 with degrees of freedom equal to the sum of the sample sizes minus 2. If the t-value exceeds the critical t-value, we reject the null hypothesis.

In this case, the t-value is calculated and compared to the critical t-value using the provided standard normal distribution table. Since the t-value exceeds the critical t-value, we can reject the claim that male and female high school students have equal exam scores.

Therefore, the correct answer is:

B. Male and female high school students have different exam scores.

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The degrees of freedom for an independent t-test when n1 = 16 and n2 = 12 are 26.

Given,

n1 = 16

n2 = 12

Here,

An independent t-test, often known as a two-sample t-test, compares the means of two unrelated groups to see whether they are significantly different from each other. The t-test is an essential method that can help you determine whether or not a certain hypothesis is true, regardless of whether or not it is accurate.

Degree of freedom for independent t test: DF = (n1 + n2) - 2

DF = (16 + 12) - 2

DF = 26

Therefore, the degrees of freedom for an independent t-test when n1 = 16 and n2 = 12 are 26.

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Answer:

2.44706 mph

Step-by-step explanation:

Given that :

Distance = rate * time

Rate of boat + rate of current = 4mph

If rate of current = c ;

Downstream:

85 = 4t

Upstream :

52 = (4 - c)t

85/4 = 52/(4 - c)

85(4 - c) = 52 * 4

340 - 85c = 208

-85c = - 132

c = 132 / 85

c = 1.55294

Rate of boat in still water :

4 - c

4 - 1.55294

= 2.44706 mph

Step-by-step explanation:

please mark me as brainlest

Answer:

Step-by-step explanation:

y = 3 times x

or: y divided by x = 3

Answer:

Step-by-step explanation:

Replacing it

Answer:

17.6 ft

Step-by-step explanation:

tan 37 = 130/x

x = 130/tan 37 = 130/0.7536 = 172.5 feet

tan 40 = 130/y

y = 130/tan 40 = 130/0.8391 = 154.9

172.5 - 154.9 = 17.6 ft

Answer:

17.6 Ft

Step-by-step explanation:

Geometry B E2020!! :3

We reject the null hypothesis and conclude that there is evidence of a difference in average job satisfaction among the three management styles at a significance level of 0.10.

The null hypothesis is a kind of hypothesis which explains the population parameter whose purpose is to test the validity of the given experimental data.

To test for a difference in average job satisfaction among the three management styles, we can use a one-way analysis of variance (ANOVA).

The null hypothesis is that there is no difference in average job satisfaction among the three management styles. The alternative hypothesis is that there is a difference in average job satisfaction among the three management styles.

We can use a significance level of 0.10.

To perform the ANOVA, we first calculate the sample mean and standard deviation for each group:

- Authoritarian: mean = 60.5, standard deviation = 12.1

- Laissez-faire: mean = 53.2, standard deviation = 9.5

- Participative: mean = 71.8, standard deviation = 8.7

We can then calculate the between-group and within-group sum of squares:

- Between-group sum of squares: 784.96

- Within-group sum of squares: 2860.47

Using the degrees of freedom of 2 and 27 (10 employees in each group, so a total of 30 employees), we can calculate the F-statistic:

F = (784.96 / 2) / (2860.47 / 27) = 4.33

Looking up the critical F-value for a significance level of 0.10 with 2 and 27 degrees of freedom, we find that the critical F-value is 2.54.

Since the calculated F-statistic (4.33) is greater than the critical F-value (2.54), we reject the null hypothesis and conclude that there is evidence of a difference in average job satisfaction among the three management styles at a significance level of 0.10.

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On adding three digit number 109 to 7845 we get 7954 so the number is 109.

The one -ended or all of the addends in a 3-digit addition are numbers of three digits. Three-digit numbers can be added by placing them in columns so according their place values. Following that, we start adding the numbers from of the ones and tens columns before finishing with the hundreds column.

The numbers being added are termed addends, and the outcome of the operation, or the answer we ultimately get, is referred to as the sum. It is a fundamental mathematical operation that we employ on a daily basis. We add numbers in a variety of circumstances.

7845 + 1100

= 8945 so it is wrong

7845+109=7954

109 is 3 digit

and because of that, we won't need to consider any other options. If you checked them again, you would not receive a three-digit number.

so 109 is your answer

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Answer:

(x, y) = (-1, 1)

Step-by-step explanation:

\(y = 2x +3 ----(1) \\\\y = x + 2 ----(2)\\\\substitute \ (2) \ in \ (1) : x + 2 = 2x + 3\)

\(x - 2x = 3 - 2\\\\-x = 1\\\\x = -1\\\\Substitute \ x = -1 \ in \ (2) : y = -1 + 2 => y = 1\)

Complete question :

The 100m dah times in the girl's track meet were normally distributed with a mean of 13 seconds and a standard deviation of 0.3 seconds.

Lana finished the race in 13.2 seconds . If 84 other girls ran in the event, approximately how many runners did she beat?

Answer:

21 runners

Step-by-step explanation:

Mean, μ = 13 seconds

Standard deviation, σ = 0.3

Lana's race time = 13.2

We find the proportion of runners who had race time above 13.2 ;

Proportion of who had race tune above 13.2

P(x > 13.2)

Obtain the Zscore

Zscore = (x - μ) / σ

Z = (13.2 - 13) / 0.3

Zscore = 0.2 / 0.3 = 0.6667

P(Z > 0.6667) = 0.25239 (Z probability calculator)

This is about 0.25239 * 100 = 25.24% = 25% (nearest percent)

Hence, Number of runners Lana beat = 25% of total runners ;

0.25 * 84 = 21

Hence, Lana beat about 21 runners

Answer:

2/5

Step-by-step explanation:

Depending on the level of difficulty, there are three different dividing methods. These include the bus stop approach, the chunking method, and the long division method. The chunking method is also known as division by repeated subtraction.

One of the four fundamental arithmetic operations, or the process by which two or more numbers are added together to create a new number, is division. Multiplication, addition, and subtraction make up the remaining operations.

The opposite of multiplication is division.

Depending on the level of difficulty, there are three different dividing methods. These include the bus stop approach, the chunking method, and the long division.

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Autumn's physiological response, characterized by her increased heart rate, sweaty hands, and flushed cheeks, indicates that her sympathetic nervous system has been activated.

Autumn's physiological response, such as an increased heart rate, sweaty hands, and flushed cheeks, is a typical manifestation of the fight-or-flight response, which is controlled by the sympathetic nervous system. In this situation, Autumn's body is reacting to a perceived threat or a stressful stimulus, which in this case is the presence of the boy she has a crush on.

When the sympathetic nervous system is activated, it triggers the release of stress hormones like adrenaline, which leads to various physiological changes in the body. These changes include increased heart rate, dilation of blood vessels, increased blood flow to the muscles, and sweating, all of which prepare the body for action in response to a perceived threat. This response is part of the body's automatic reaction to stressful or arousing situations and helps to mobilize the body's resources to deal with the perceived threat or challenge.

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1. What is the relationship between education level and income in this population? 2. How does the popularity of different music genres vary across different age groups?

An interpretation is a way of understanding or explaining something. Interpretation often involves making connections between different elements or pieces of information to create a coherent understanding. It can also involve applying theories, frameworks, or methods to analyze or explain a particular subject. Ultimately, interpretations are subjective and may vary based on individual experiences and perspectives, making it important to consider multiple interpretations when analyzing a particular subject.

Here is two example questions:

1. What is the relationship between education level and income in this population?

Interpretation: To answer this question, you would need to examine a table that includes columns for education level and income, such as a cross-tabulation or a summary statistics table. You could look for patterns or trends in the data, such as higher incomes being associated with higher levels of education. You might also look for any outliers or anomalies in the data that could be affecting the overall relationship between education level and income.

2. How does the popularity of different music genres vary across different age groups?

Interpretation: To answer this question, you would need to examine a table that includes rows for different age groups and columns for different music genres, such as a frequency table or a bar chart. You could look for patterns or trends in the data, such as certain music genres being more popular among younger age groups or older age groups. You might also look for any outliers or anomalies in the data that could be affecting the overall relationship between age and music genre popularity.

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Answer:To divide decimal numbers: Multiply the divisor by as many 10's as necessary until we get a whole number. Remember to multiply the dividend by the same number of 10's.

Step-by-step explanation:

The result of biconditional statements are as follow,

a) True. 2 + 2 = 4 and 1 + 1 = 2.

b) False. 1 + 1 = 2, but 2 + 3 = 5, not 4.

c) False. 1 + 1 = 2, but monkeys cannot fly.

d) False. 0 is not greater than 1, but 2 is greater than 1.

a) 2 + 2 = 4 if and only if 1 + 1 = 2.

This biconditional is true.

Both statements are true because basic arithmetic principles dictate that 2 + 2 equals 4, and 1 + 1 equals 2.

b) 1 + 1 = 2 if and only if 2 + 3 = 4.

This biconditional is false.

The first statement is true since 1 + 1 equals 2. However, the second statement, 2 + 3 = 4, is false because 2 + 3 equals 5, not 4.

c) 1 + 1 = 3 if and only if monkeys can fly.

This biconditional is false.

The first statement, 1 + 1 = 3, is false because 1 + 1 equals 2, not 3. The second statement, "monkeys can fly," is also false.

because monkeys are not capable of natural flight.

d) 0 > 1 if and only if 2 > 1.

This biconditional is false. The first statement, 0 > 1, is false because 0 is not greater than 1.

However, the second statement, 2 > 1, is true because 2 is indeed greater than 1.

Therefore, the biconditional is false since the statements do not have the same truth value.

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The above question is incomplete, the complete question is:

Q : Determine whether these biconditionals are true or false.

a) 2 + 2 = 4 if and only if 1 + 1 = 2.

b) 1 + 1 = 2 if and only if 2 + 3 = 4.

c) 1 + 1 = 3 if and only if monkeys can fly.

d) 0 > 1 if and only if 2 > 1

Answer: 81

Step-by-step explanation: 20% of 135= 27, and 27x3=81

Answer:

The second option.........

At a discount rate of 20%, the present value of your aunt’s offer of $22,000 in 17 years is approximately $190.46.


To calculate the present value of your aunt’s offer, we use the discount rate of 20%. The formula for present value is PV = FV / (1 + r)^n, where PV is the present value, FV is the future value, r is the discount rate, and n is the number of periods. Plugging in the values, we have PV = $22,000 / (1 + 0.20)^17, which gives us approximately $190.46.

For the investment scenarios, we use the compound interest formula: A = P(1 + r/n)^(nt), where A is the final amount, P is the principal amount (initial investment), r is the interest rate, n is the number of times interest is compounded per year, and t is the number of years. Plugging in the given values for each case, we calculate the final amounts.
a. A = $12,500(1 + 0.07/1)^(1*8) ≈ $19,956.77.
b. A = $12,500(1 + 0.10/1)^(1*17) ≈ $46,426.32.
c. A = $12,500(1 + 0.12/2)^(2*20) ≈ $73,785.59.
Therefore, if you invest $12,500 today, you will have approximately $19,956.77 in 8 years at 7%, $46,426.32 in 17 years at 10%, and $73,785.59 in 20 years at 12% compounded semiannually.

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