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3 years ago

Solve for x and y 10x + 7y = 1435

2 answers:

8 0

To solve for x do the following steps.

Step 1. Subtract $7y$ from both sides

$10x=1435-7y$

Step 2. Divide both sides by $10$

$x=\frac{1435-7y}{10}$

Step 3. Factor out the common term $7$

$x= \frac{7(205-y)}{10}$

Now lets solve for y. Follow the steps below.

Step 1. Subtract $10x$ from both sides.

$7y=1435-10x$

Step 2. Divide both sides by 7.

$y= \frac{1435-10x}{7}$

Step 3. Factor out the common term 5.

$y= \frac{5(287-2x)}{7}$

Done! :)

bearhunter [10]3 years ago

6 0

Move all terms that don't contain x to the right side and solve.
x = -7y/10 + 718/5

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1) Data given and notation

$s^2 =16$ represent the sample variance

s=4 represent the sample standard deviation

$\bar x$ represent the sample mean

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A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population mean or variance lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

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On this case the sample variance is given and for the sample deviation is just the square root of the sample variance.

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$df=n-1=20-1=19$

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