What is y-8=3(x+1) in standard form

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

What is the reflection image of (5,-3) across the line y = -x?

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=