80 percent of what number equals 100

Mary beth used the mapping rule to find the coordinates of a point that had been rotated 90° counterclockwise around the origin. examine the steps to determine whether she made an error. m (3, –6) is rotated 90° counterclockwise. (x, y) → (–y, x) 1. switch the x- and y-coordinates: (6, –3) 2. multiply the new x-coordinate by –1: (6(–1), –3) 3. simplify: (–6, –3) .

25 ! the line of best fit is h = 5a + 86. predict the height at age 16. show your work.

Find the solution(s) to the system of equations. select all that apply y=x^2-1 y=2x-2