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3 years ago

Solve for the variable 8x+7=-9

Mathematics

2 answers:

Vitek1552 [10]3 years ago

5 0

Answer:

Step-by-step explanation:

I've already solved this problem.

sukhopar [10]3 years ago

4 0

Answer:

x=-2

Step-by-step explanation:

first u subtract 7 on both sides resulting on 8x=-16. Then to isolate x u divide by 8 on both sides.

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Elle decreased her monthly budget from $250 to $200. Calculate the percent decrease

kirill [66]

Formula for finding percent change (increase or decrease) is amount of the change divided by the original amount.

Here, the amount of the change is 50 and the original amount is 250.

50/250= 0.2

Multiply by 100 to get percent.

20% decrease (because budget went down)

6 0

3 years ago

Find the maximum number of children to whom 30 sweaters and 45 trousers can be equally divided. Also find out how many sweaters

Vinvika [58]

Answer:

15 children can divide them with eachother, each get 2 sweaters and 3 trousers

Step-by-step explanation:

15×2=30

15×3=45

7 0

3 years ago

A one year membership to a health club costs $480. This includes a $150 fee for new members that is paid when joining. Which equ

antoniya [11.8K]

Hi Dwfailla,

To get the answer we need to add $480 and $150. So, $480 + $150 would be your equation.

Hope This Helps!

Cupkake~

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4 years ago

Read 2 more answers

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Nataly [62]

The correct answer is B I’m pretty sure

8 0

4 years ago

Read 2 more answers

The mean of the sample is 24.444 squares with a standard deviation of 2.45 squares. Single-ply toilet paper requires 26 squares

Romashka [77]

Answer:

t = -2.69 , p = 0.0078

Step-by-step explanation:

We have the following data:

Sample Mean = x = 24.444

Sample Standard Deviation = s = 2.45

Sample size = n = 18

Josh wants to test that mean number is lesser than 26. So our test value is 26 i.e.

u = 26

Since Josh wants to test that mean would be fewer than 26, so this would be a left tailed test with a less than sign in Alternate Hypothesis. Therefore, the hypothesis would be:

$H_{o}: u\geq 26\\H_{a}: u$

Since, we do not know the value of Population standard deviation, and we have the value of sample standard deviation, we will use One-Sample t-test for the population mean.

The formula to calculate the test-statistic would be:

$t=\frac{x-u}{\frac{s}{\sqrt{n}}}$

Substituting the values in this formula gives us:

$t=\frac{24.444-26}{\frac{2.45}{\sqrt{18}}}\\t=-2.69$

This means, the test statistic would be -2.69

Since, the sample size is 18, the degrees of freedom would be:

Degrees of freedom = df = n - 1 = 17

To find the p-value we need to check the p-value against test statistic of 2.69, with 17 degrees of freedom and One-tailed test. This value comes out to be:

p-value = 0.0078

Therefore, the correct answer would be:

t = -2.69 , p = 0.0078

4 0

3 years ago