Write is a related subtraction fact for 7+6=13

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) .

Explain how you can use the associative property to evaluate (7x50)x4.

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?