Answer:
13)5m-10
14)8y+16
15)-3m-12
16)a²+3a
17)h²-2h
18)2m²+8m
19)-2z+16
20)-4x²+40x
21) 12x and 60
22)x and 4
A number multiplied by its self for ex 7 x 7 = 49 square root of 49 is 7
