The height of an airplane during a landing is given by 22,000+(−480t)where t is the time in minutes. (the picture is below)

Answers

19,600 feet

17,200 feet

14,800 feet

12,400 feet

Explanation

The expression 22,000+(−480t) represent the height reached by the airplane at a given time t.

# when t = 5 minutes

22,000+(−480×5) = 22,000 - 2,400

                                 = 19,600 feet

# when t = 10 minutes

22,000+(−480×10) = 22,000 - 4,800

                                 = 17,200 feet

# when t = 15 minutes

22,000+(−480×15) = 22,000 - 7,200

                                =14,800 feet

# when t = 20 minutes

22,000+(−480×20) = 22,000 - 9,600

                             = 12,400 feet

huh? im pretty sure it is in 199

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!