The March number is a measurement of speed named after the man who suggested it, Ernst March (1838-1916). The speed of an aircraft varies directly as its March number. Shown are two aircrafts. Use the figures to determine the blackbirds speed.

$27.5

step-by-step explanation:

$110.00 divided by 4

europa2433

europa2433

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!