Can somone please help me with this

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

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

Write 5(6x+4)-2(5x-2) in the form a(bx+c) where a,b and c integers and a> 1