Ms. robinson gave her 12 minutes to read. carrie read 512 pages in that time. at what rate, in pages per hour, did carrie read?

12 minutes is one fifth of an hour or 12=60×1/5

So we can multiply 512 by five to get how many words per hour Carrie read at. 512×5=2560

1010: 3030

is it i think

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!