Which table represents a proportional relationship that has a constant proportionality equal to 0.8

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.

Find the balance at the end of 4 years if 1000 is deposited at the rate of

Atemperature of 1.64◦f corresponds to answer in units of ◦c.