The band knows 45. song. it play 12 songs in the first set, 15 song in the second set, and 11 songs in the last set. if no songs were repeated, how many songs does the band know that it didn't play

7 songs

Step-by-step explanation:

12+15+11 is 38

45-38 is 7.

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!

step-by-step explanation:

duck you