David is selling floral arrangements. each arrangement uses 1 vase and 12 roses. each vase costs david $2.00. let c be the total cost of the arrangement and r be the cost of 1 rose. which equation should david use to find the total cost of each arrangement? a. c = 2r + 12 b. 12c = r + 12 c. 12 = c + 2r d. c = 12r + 2 5 points

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) .