Due by the end of the day help!!

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

Which expression gives the area of the triangle shown below

Determine domain and range, largest open interval, and intervals which function is continuous.