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2 years ago

How do you solve these? Please explain steps as well. Thanks.

Mathematics

1 answer:

posledela2 years ago

3 0

$7x-3=2x-33 \\
7x-2x=-33+3\\
5x=-30\\
x=-6\\\\
3(x-2)=2(2x-1)\\
3x-6=4x-2\\
4x-3x=-6+2\\
x=-4
$

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13 less than 8 times a number is the same as the number plus 1

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Answer:

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Step-by-step explanation:

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2 years ago

9.1 x 10-31 kg.

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1 electron has a mass of 9.1 X 10-31 kg. How many electrons n does it take to make 1 kg?

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2 years ago

Michmoo Computer Company sells computers and computer parts by mail. The company assures its customers that products are mailed

Anastaziya [24]

Answer: (60.858, 69.142)

Step-by-step explanation:

The formula to find the confidence interval for mean :

$\overline{x}\pm z_c\dfrac{\sigma}{\sqrt{n}}$ , where $\overline{x}$ is the sample mean , $\sigma$ is the population standard deviation , n is the sample size and $z_c$ is the two-tailed test value for z.

Let x represents the time taken to mail products for all orders received at the office of this company.

As per given , we have

Confidence level : 95%

n= 62

sample mean : $\overline{x}=65$ hours

Population standard deviation : $\sigma=18$ hours

z-value for 93% confidence interval: $z_c=1.8119$ [using z-value table]

Now, 93% confidence the mean time taken to mail products for all orders received at the office of this company :-

$65\pm (1.8119)\dfrac{18}{\sqrt{62}}\\\\ 65\pm4.142\\\\=(65-4.142,\ 65+4.142)\\\\= (60.858,\ 69.142)$

Thus , 93% confidence the mean time taken to mail products for all orders received at the office of this company : (60.858, 69.142)

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3 years ago