Can I add a photo here because I don't know how to ask a question in math​

Yes u can just click the thing that looks like a paper clip.

Step-by-step explanation:

you add a photo by pressing the link button at the bottom and choosing which picture you want

the answer is stop cheating on things stoopid

step-by-step explanation:

im eatin up the 44

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!