Let a = -2.5, b = -4.1, c = 7.8, and d = 3.2
6. evaluate (a + b) / (c – d)
the final answer should have no decimals in the numerator, denominator, or final answer. (hint: multiply the top and bottom of your fraction answer by 10, then simplify the fraction.)
7. evaluate (b + d)2/a - c

go on the tube you might find some information there

cant open file sorry!

step-by-step explanation:

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!