Aball is thrown at 14.7 m/s from the top of a 88.2 meter tall building. the equation for the balls height s at time t seconds after the ball is thrown; s(t) = –4.9t2 + 14.7t + 88.2. how many seconds does the ball take to hit the ground?
a) 2
b) 3
c) 4
d) 6

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!

i have no clue what you just said. write a question in english?

b. f(x) = –√x + 3this is the correct answer