Mrs. Wood had $150.55 in her checking account as of Monday. She gave ⅕ to charity on Tuesday, she then gave ¼ of her remaining amount to her brother as a birthday present on Tuesday, and then spent $15.67 from her remaining amount on Wednesday. What is the new balance in Mrs. Wood's checking account?

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!

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