If AM = 7, MB = 6, and CM = 8, find CD.
5.25
10.25
13.25

AM x MB = CM x DM
7 x 6 = 8 x DM
42 = 8DM
DM = 42 /8
DM = 5.25
CD = CM + DM
CD = 8 + 5.25 = 13.25