# An air traffic controler is tracking two planes. To start, Plane A was at an altitude of 990 meters, and Plane B was at an altitude

An air traffic controler is tracking two planes. To start, Plane A was at an altitude of 990 meters, and Plane B was at an altitude of 1476 meters. Plane A ls losing altitude at 18 meters per second, and Plane B is losing altitude at 27 meters per second.

Let x be the number of seconds that have passed.

(a) For each plane, write an expression for the altitude of the plane
after x seconds.
Altitude of Plane A (In meters) =
Altitude of Plane B (in meters) =

(B) Write an equation to show when the two planes would be at the same altitude

## This Post Has 4 Comments

1. Expert says:

there is no grid

step-by-step explanation:

2. Expert says:

hello from mrbilldoesmath!

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!

3. Expert says:

It’s 5 points actually

4. Expert says:

Hello i think it’s 20