I need yall to be 1000000% sure of your answers because hmm hmm my grades are sinking faster then the titanic

Answer

1.1056 2.15 min

Step-by-step explanation:

I'm not too certain if the first one is asking for the speed but the second is 15 mins

2

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!