Need on 4 math questions : p fairly ez ones

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

Before simplifying, how many terms are there in the expression 2x - 5y + 3 + x?

Ineeeeed this is due tomorrow and i dont know the answer can you find all the exponents