Help s what is 2+2 plsss help it's a test

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

What is the inverse of the function f(x) = 2x + 1?

One positive number is 9 more than twice another. if their product is 95, find the numbers