5. The school custodian is on the roof of his elementary school throwing tennis balls back to
students below. The height of the tennis ball can be modelled by the function h(t) =
-4.9t2 + 9.8t +9, where h(t) is the height of the ball above the ground, in metres, and t
is the time the ball is in the air, in seconds.
a)
What was the initial height of the ball?
b)
How long was the ball in the air? Show your work.

distance covered by pamela in 9 l of fuel = 99km

let us apply unitary method here.

distance covered by pamela in 1 l of fuel =99/9 =11 km

now let us find distance covered by pamela if she has 12 l of fuel.

distance covered in 12 l = distance covered in 1 l of fuel * 12

we know that distance covered by here in 1 l is 11 km.

so distance covered in 12 l of fuel = 11*12 = 132 km.

then say something, tell them they won’t respect you if you don’t even have respect for your self sweetheart you need to lay it on them, all of it : )