Solve the following system of linear equations by substitution x=-7/8y+39/8 y=3/7x-5/7

Describe in detail how you would construct a 95% confidence interval for a set of 30 data points whose mean is 20 and population standard deviation is 3. be sure to show that you know the formula and how to plug into it. also, clearly state the margin of error.

Acylinder and its dimensions are shown. which equation can be used to find v, the volume of the cylinder in cubic centimeters?

What is 100,000 times 1/100,000, using the standard method of multiplication? write the answer as 10 to a power.