Martin lifted weights in the gym, Monday thru Friday, for 20 weeks. each day he did 25 repetitions. how many repetitions did he do over the course of 20 weeks? then round the answer to the nearest thousand.

43

step-by-step explanation:

b. x + 1

step-by-step explanation:

i'am smart

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!