What is 9 exponent of -2 simplified?

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.

What does x = in this equation x+3+2x=x+5

What additional information could be used to prove abc =mqr using sas? check all that apply.