Salma carns 43 dollars per week working part-time at a book store. She makes one dollar more for each book that she sells. The amount, A (In dollars), that Salma eams in a week if she sells b books is given by the following function.
A(b) = 43 + b
How much does Salma earn in a week if she sells 33 books?
m.

its the fourth option

-2/

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!