John's race car memorabilia rose in value 6% last year. it is now worth $141.12. what was it worth a year ago? a. $84.67 b. $85.20 c. $133.13 d. $134.65

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!

this is a good question! i'll do some research and come back when i have the answer!