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2 years ago

I NEED EMERGENCY SOS

Mathematics

1 answer:

maks197457 [2]2 years ago

6 0

Answer:

Step-by-step explanation:

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Convert the following equation to slope-intercept form to graph. 7x – y = –3

jekas [21]

Slope-intercept form:
y = m x + b
7 x - y = - 3
- y = - 7 x - 3 / * ( - 1 )( we have to multiply both sides of the equation by - 1 )
Answer:
y = 7 x + 3

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3 years ago

The length of a rectangle is twice its width. The Perimeter is 42 cm. Find the length of each side.

lakkis [162]

Answer:

A) L = 2*W

B) 2L + 2W = 42

We'll put Equation A) into B)

2*2W + 2W = 42

4W + 2W = 42

6W = 42 cm

Width = 7 cm

Length = 14 cm

Step-by-step explanation:

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3 years ago

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2 years ago

A chemist examines 15 geological samples for potassium chloride concentration. The mean potassium chloride concentration for the

NikAS [45]

Answer:

$0.376-2.145\frac{0.0012}{\sqrt{15}}=0.375$

$0.376+2.145\frac{0.0012}{\sqrt{15}}=0.377$

And we are 95% confident that the true mean of chloride concentration is between 0.375 and 0.377 cc/ cubic meter

Step-by-step explanation:

Data provided

$\bar X=0.376$ represent the sample mean for the chloride concentration

$\mu$ population mean (variable of interest)

s=0.0012 represent the sample standard deviation

n=15 represent the sample size

Confidence interval

The confidence interval for the mean is given by the following formula:

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

Since we need to find the critical value first we need to begin finding the degreed of freedom

$df=n-1=15-1=14$

The Confidence is 0.95 or 95%, the significance would be $\alpha=0.05$ and $\alpha/2 =0.025$ , and the critical value for this case with a t distribution with 14 degrees of freedom is $t_{\alpha/2}=2.145$