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4 years ago

Answer plz I will give brainiest for the first to answer correctly.

Mathematics

2 answers:

svetlana [45]4 years ago

7 0

Answer:

Step-by-step explanation:

Step 1. Combine like terms

1/3x + 166 = x

Step 2. Subtract 1/3x from both sides

166 = 2/3x

Step 3. Multiply it all by 3/2 to get rid of the 2/3

249 = X

AnnyKZ [126]4 years ago

6 0

Answer:

x=249

Step-by-step explanation:

1/3 x -5 +171 =x

Combine like terms

1/3x +166 = x

Subtract 1/3x from each side

1/3x -1/3x +166 = x - 1/3x

166 = x-1/3x

Get a common denominator for the right

166 =3/3x -1/3x

166 = 2/3 x

Multiply by 3/2 To isolate x

166 * 3/2 = 2/3 x*3/2

249 =x

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3 years ago

Read 2 more answers

The electric cooperative needs to know the mean household usage of electricity by its non-commercial customers in kWh per day. A

vekshin1

Answer:

$15.7-2.58\frac{2.3}{\sqrt{1731}}=15.6$

$15.7+2.58\frac{2.3}{\sqrt{1731}}=15.8$

We are 99% confident that the true mean of electricity comsumption is between (15.6 and 15.8) kWh

Step-by-step explanation:

Information provided

$\bar X= 15.7$ represent the sample mean for the usage of electricity

$\mu$ population mean (variable of interest)

$\sigma= 2.3$ represent the population standard deviation

n=1731 represent the sample size

Confidence interval

The confidence interval for the mean is given by the following formula if we know the population deviation:

$\bar X \pm z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$ (1)

The Confidence level provided is 0.99 or 95%, the value of significance is $\alpha=0.01$ and $\alpha/2 =0.005$ , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-NORM.INV(0.005,0,1)".And we see that $z_{\alpha/2}=2.58$