15ab/40bc is the right answer 3a/5c?

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.

One integer is 8 times another. if the product is 72, then find the integers

Which statement describes surface features called maria on the moon