4 years ago

Need help with this question

Mathematics

1 answer:

Ratling [72]4 years ago

3 0

I think the answer is y=5/1-9

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Please help no files just type it in please and thank you <3333

padilas [110]

Answer:

Step-by-step explanation:

5×9=45

Hope this helps! :)

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3 years ago

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Which numbers are included in the set of integers that when added to

brilliants [131]

Wouldnt it be all of them?

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3 years ago

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The speeds of vehicles traveling on a highway are normally distributed with a population standard deviation of 7 miles per hour

True [87]

Answer: $(56.03\ ,63.97)$

Step-by-step explanation:

Given : The speeds of vehicles traveling on a highway are normally distributed .

Standard deviation: $\sigma: 7$

Since , sample size : $n=20$ , which is small sample (n<30) so the test applied here is a t-test.

Degree of freedom= $n-1=20-1=19$

Sample mean : $\overline{x}=60$

Level of significance : $1-\alpha:0.98$

Then , significance level : $\alpha: 1-0.98=0.02$

Using t-distribution table , Critical value : $\text{t-score}=t_{n-1, \alpha/2}= 2.539483$

The confidence interval for population mean is given by :-

$\overline{x}\pm t_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}$

$60\pm( 2.539483)\dfrac{7}{\sqrt{20}}\approx60\pm3.97=(56.03\ ,63.97)$

Hence, a 98% confidence interval for the population mean= $(56.03\ ,63.97)$

4 0

3 years ago

Evaluate when a=-6, b= 5, c= -2:<br> a3 - b + 4c2

Flura [38]

Answer:

-39

Step-by-step explanation:

a=-6 b=5 c=-2

a3-b+4c2

(-6)3-(5)+4(-2)2

8 0

3 years ago

Last week, Kip went to the fair. It costs $4.59 to enter the fair and $1.25 per ticket. In the equation below, x represents the

Ainat [17]

Answer:

B.) 15

Step-by-step explanation:

Fist you want to plug in 23.34 as your Y. Next you want to subtract 4.59 from 23.34. Finally, to get the variable alone, divide the answer you got from subtracting by 1.25.

3 0

2 years ago