Can someone me figure out how to do 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

Me complete this proof! prove that a quadrilateral is a square. me with the steps for this proof.

Which inequality is equivalent to -3x < -12? x < 4 , x < -4 , x > 4, x > -4