00:00 Which statement is true?
A. 24 - 15 * 4 - 3 x 2 = 30
O B. 24 - 15 * (4-3)* 2 = 30
C. (24 - 15) * 4 - 3 x 2 = 30
D. (24 - 15) * 4 - 3* 2 = 66

A or C sorry if I'm wrong but hopefully this helps you to understand/figure out the answer

2nd one in the first row is correct

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!