Help please Will give branliest if right

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 are the constants in this expression? -10.6+9/10+2/5m-2.4n+3m

What other information do you need to prove triangle dac=bca by asa