e) Not sure, sorry
f) 15c
g) Not sure, sorry
h) 9x
1) c * -16c is saything as 1c * -16c
so 1 * -16 = -16
and c * c = c^2
Answer= -16c^2
2) c - 16c
1 - 16 = -15
Answer= -15c
3) -6y^2 * 12y
-6 * 12 = -72
y^2 * y = y^3
Answer= -72y^3
4) 4x * x * 5x
4 * 1 * 5 = 20
x * x * x = x^3
Answer= 20x^3
