You have a rectangular box with the dimensions of 4 feet x 2 feet x 1 foot. You have to get it painted red. The painting will cost
$2.50 per square foot. How much will it cost you?

120

Step-by-step explanation:

4x2x1=8, 6 sides with 2.50

i think ur answer is   (3,-1)

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!