What is the sum of (4x^2+x-4)+(2x^2-6x+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

Thelime contains the point(-3,0) and parallel x-3y=3( show all work)

With alll of except for the 2 that i did already