Atrieg is floating down the river at 3 miles bu hour and a fish is swimming up the river ar 12 miles a hour , how long will it take the fish to swim by the trig?

70

step-by-step explanation:

2*5=10

4*15=60

60+10=

70

where are the choices?

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!