I will give brainliest to whoever helps me with this question. Also, if you could please explain to me how you solved it I would appreciate it!

Heyy It's me again! I hope I can help you with this question too!

Im pretty sure it's like 5 or 6 ft

Step-by-step explanation:

sry if its not right

4.5 ft

Step-by-step explanation:

21-16.5=4.5

brainliest please? ^^

cheater

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!