Which choice is equivalent to the product below when x>0 square root 5x^2 times square root 15x^2

Asimple random sample of size nequals14 is drawn from a population that is normally distributed. the sample mean is found to be x overbar equals 70 and the sample standard deviation is found to be sequals13. construct a 90% confidence interval about the population mean

How do i put 3(x+7) in distributive property

What is the product? a-3/15a × 5/a-3