Me. i'm confused. consider the following geometric sequence. -5, 10, -20, if the recursive formula for the sequence above is expressed in the form a^n=b*^n-1, determine the value of b. b= (choices are 2, -2, 5, -5)

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) .