Given the function f(x) =-2x^2 + 4x -7 find f(-4)

What is the solution to the system of the equations? x = y - 3 x + 3y = 13

Solve each equation using the quadratic formula. find the exact solutions. 6n^2 + 4n - 11

Carl's candies has determined that a candy bar measuring 3 inches long has a z-score of +1 and a candy bar measuring 3.75 inches long has a z-score of +2. what is the standard deviation of the length of candy bars produced at carl's candies?