One clerk can file 12 folders per minute and a second clerk, 9. How long will it take them working together to file 672 folders? *

b

step-by-step explanation:

the word superfluous means unnecessary

answer: a.

step-by-step explanation: the answer is a. because, you need to converge the fractions to find a solution.

w'x is 0.

hope it

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!