I don’t know this need help thank you :)

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) .

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

What is the radius of a circle with an area of 78.5 cubic inches? use 3.14 for pie