What is x if the volume of the box is 70 in 3

The answer is 2,

If the find the area of one side on the end (3.5 in ² )

You take 3.5 and dived 70 by that and get 20

70/3.5 = 10x

10x = 20

x = 2

nope

step-by-step explanation:

hello from mrbilldoesmath!

answer:

25x^2 + 90x + 84

discussion:

mn(x) = m(n(x)) = m( 5x + 9) =

(5x + 9)^2 + 3 =>

25x^2 + 90x + 9^2 + 3 =

25x^2 + 90x + 84                 (as 9^2 = 9*9 = 81)

which is the second choice

regards,  

mrb

p.s.   i'll be on vacation from friday, dec 22 to jan 2, 2019. have a great new year!