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lyudmila [28]
3 years ago
12

It’s number 5 I have to do redo work help

Mathematics
2 answers:
ElenaW [278]3 years ago
8 0

7*5x+7*4

35x+28

the answer is this

Luda [366]3 years ago
6 0
So what you do is multiply the 7 and 5x and then multiply the 7 and 4 so it will look like this 35x+28 and that is your answer
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Simplify 2/5 divided by 1/4
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2/5=0.2

1/4=0.25

0.2/0.25= 0.8

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Why is one multiply by zero is answer zero
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because if you multiply 3 by 0 its the same thing as saying 0+0+0 and that is still 0 (hope this was helpful)

7 0
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3 fewer than a number squared and four
grigory [225]

Answer:

(n^{2}+4)-3

Step-by-step explanation:

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7 more than 3 times a number is 52
maksim [4K]

Answer:

15

Step-by-step explanation:

Let x be the number

3 times the number  = 3x

7 more than 3 times a number = 3x +7

3x + 7 = 52

3x = 52 -7

3x = 45

x = 45/3

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6 0
3 years ago
uppose that an automobile manufacturer advertises that its new hybrid car has a mean gas mileage of 50 miles per gallon. You tak
Harlamova29_29 [7]

Answer:

t=\frac{47-50}{\frac{5.5}{\sqrt{30}}}=-2.988    

p_v =2*P(t_{(29)}  

If we compare the p value and the significance level given \alpha=0.05 we see that p_v so we can conclude that we have enough evidence to fail reject the null hypothesis, so we can conclude that the true mean is significantly different from 50 mpg at 5% of signficance.  

Step-by-step explanation:

Data given and notation  

\bar X=47 represent the sample  mean  

s=5.5 represent the sample standard deviation

n=30 sample size  

\mu_o =50 represent the value that we want to test

\alpha=0.01 represent the significance level for the hypothesis test.  

t would represent the statistic (variable of interest)  

p_v represent the p value for the test (variable of interest)  

State the null and alternative hypotheses.  

We need to conduct a hypothesis in order to check if the true mean is 50 or no, the system of hypothesis would be:  

Null hypothesis:\mu = 50  

Alternative hypothesis:\mu \neq 50  

If we analyze the size for the sample is = 30 but we don't know the population deviation so is better apply a t test to compare the actual mean to the reference value, and the statistic is given by:  

t=\frac{\bar X-\mu_o}{\frac{s}{\sqrt{n}}}  (1)  

t-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".  

Calculate the statistic

We can replace in formula (1) the info given like this:  

t=\frac{47-50}{\frac{5.5}{\sqrt{30}}}=-2.988    

P-value

The first step is calculate the degrees of freedom, on this case:  

df=n-1=30-1=29  

Since is a two tailed test the p value would be:  

p_v =2*P(t_{(29)}  

Conclusion  

If we compare the p value and the significance level given \alpha=0.05 we see that p_v so we can conclude that we have enough evidence to fail reject the null hypothesis, so we can conclude that the true mean is significantly different from 50 mpg at 5% of signficance.  

4 0
2 years ago
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