What is the purpose of a regression line

Which is the correct excel formula for the 80th percentile of a distribution that is n(475, 33)? =norm.dist(80,475,33,1) =norm.inv(0.80,475,33) =norm.s.inv((80-475)/33)?

Complete the solution of the equation. find the value of y when x equals to 1 9x-5y=29

What is the ordered pair of m’ after point m (5, 6) is rotated 90° counterclockwise?