I need help with #4 help if you can please and show ur work

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) .

Which basic geometric term has no width, no length, and no thickness? line b. point c. angle d. plane

What is the distance between the points (2, 5) and (5,9)?