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3 years ago

I need your help please I don’t understand this

Mathematics

2 answers:

hammer [34]3 years ago

6 0

You would replace “4” for the letter “y” so it would be 5x+7(4)=4. Then you would do 7(4) which is 28. and then you would have 5x+28=4. I hope this helps !

Step2247 [10]3 years ago

3 0

The answer is y = -5/7x + 4/7! The first step is to subtract the 5x so it’s on the other side of the equal sign. So now the equation is 7y = -5x + 4. Then divide each of them for 7

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In a geometric sequence, the_between consecutive terms is constant.

nasty-shy [4]

Answer:

In a geometric sequence, the common ratio between consecutive terms is constant.

Step-by-step explanation:

In a geometric sequence, the common ratio between consecutive terms is constant.

The n-th term of a geometric sequence with first term $a$ and common ratio $r$ is represented by the formula:

$a_{n}=a\,r^{n-1}$

For example,

$1, -3, 9, -27, 81, -243, ...$

As the common ratio 'r' between consecutive terms is constant.

r = -3/1 = -3

r = 9/-3 = -3

r = -27/9 = -3

r = 81/-27 = -3

r = -243/81 = -3

So, the common ratio between consecutive terms is constant i.e. -3. Thus, it is a geometric sequence with a common ratio -3.

4 0

3 years ago

According to USA Today, the average cost of a private university is $50,000 with a population standard deviation of $2,500. 100

Colt1911 [192]

Using the z-distribution, it is found that since the p-value is less than 0.05, there is evidence to support the claim that the average cost of private universities are decreasing.

<h3>What are the hypothesis tested?</h3>

At the null hypothesis, it is tested if the average cost is still of $50,000, that is:

$H_0: \mu = 50000$

At the alternative hypothesis, it is tested if the average cost is decreasing, that is:

$H_1: \mu < 50000$

<h3>What is the test statistic?</h3>

The test statistic is:

$z = \frac{\overline{x} - \mu}{\frac{\sigma}{\sqrt{n}}}$

In which:

$\overline{x}$ is the sample mean.

$\mu$ is the value tested at the null hypothesis.

$\sigma$ is the standard deviation of the population.

n is the sample size.

The parameters for this problem are:

$\overline{x} = 49450, \mu = 50000, \sigma = 2500, n = 100$

Hence:

$z = \frac{\overline{x} - \mu}{\frac{\sigma}{\sqrt{n}}}$

$z = \frac{49450 - 50000}{\frac{2500}{\sqrt{100}}}$

z = -2.2.

<h3>What is the p-value and the conclusion?</h3>

Using a z-distribution calculator, for a left-tailed test, as we are testing if the mean is less than a value, with z = -2.2, the p-value is of 0.0139.

Since the p-value is less than 0.05, there is evidence to support the claim that the average cost of private universities are decreasing.

More can be learned about the z-distribution at brainly.com/question/16313918

#SPJ1

8 0

2 years ago

Today I am 6 years less than half my fathers age. In 6 years, I will be 6 years more than 1/3 my father's age. How old was my fa

mel-nik [20]

Answer:

30

Explanation:

5 0

4 years ago

Read 2 more answers

Which quantity is proportional to 18⁄3? Check all that are true. 90⁄16 36⁄6 72⁄12 6⁄1 36⁄12

NikAS [45]

Answer:

36/6, 72/12, and 6/1

Step-by-step explanation:

18/3=6, so we just need to find the fractions that simplify into 6 (we reduce fractions by dividing the numerator and denominator by the greatest common factor, in this case the number must be whole, so we are just going to divide the numerator by the denominator). 90/16=5.625, it does not equal 6, so it is not proportional to 18/3, this is also true for 36/12=3. 36/6=6 so it is proportional, so is 72/12=6 and, obviously 6/1=6 so it, too, is proportional to 18/3.

6 0

3 years ago

PLEASE HELP, THANK YOU!:

Readme [11.4K]

The answer to question 1 is $8.10.

I got this by finding 18% of $45, which I assume is what the server's tax/tip is.

The answer to question 2 is 7.99.

I got this by finding 8.5 percent of 94 dollars, which is the tax.

Hope this helps, if not, comment below please!!!

4 0

3 years ago