Flying against the jetstream, a jet travels 3600 miles in 5 hours. Flying with the jetstream, the same jet travels 4400 miles in 4 hours. What is the rate of the jet in still air and what is the rate of the jetstream? Rate of the jet in still air: mi/h

Rate of the jetstream: mi/h

2500

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!