Find the magnitude of the vector that begins at (1,1) and ends at (-8,12). a. 15.81
b. 14.76
c. 14.21
d.04

Really need on these. i have no idea what to do

What is the first step of an indirect proof of a number that is divisible by two

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) .