mathematical statement justification

−2(2x3 + 4x2 − 3) + 5(x2 − 2x − 2) } given

−4x3 − 8x2 + 6 + 5x2 − 10x − 10 }

−4x3 − 8x2 + 5x2 − 10x + 6 − 10 }

−4x3 − 3x2 − 10x − 4 }

fill in the missing justifications in the correct order.

a. combine like terms; distributive property; commutative property of addition

b. commutative property of addition; combine like terms; distributive property

c. distributive property; commutative property of addition; combine like terms

d. distributive property; combine like terms; commutative property of addition

You drop a rubber ball off the roof of a 50 meter high building onto a paved parking lot. it bounces back up with every bounce, but not quite all the way back up to you. after the first bounce it bounces back only 80 percent of the distance it was dropped from. the pattern continues, meaning after every bounce it comes up to just 80 percent of the previous maximum height. so if before the first bounce the height is 50 meters, what height does the ball reach after the fifth bounce? round your answer to one decimal place and chose the correct response from the choices below:

Do you mind if you guys me with this question i’m on number 8

If you prove that ∆wxz is congruent to ∆yzx, which general statement best describes what you have proved?