Question

using the graph h=-0.002d^2 + 0.4d where h is the height of the ball, in mwtres, and d is the distance the ball travels, in metres, until it first hits the ground what is distance does the ball travel horizontally until it first hits the ground

Answer 1

what do you think will be the height of the ball when it hits the ground?

Answer 2

i.e. what will 'h' equal when the ball hits the ground?

Answer 3

i still dont understand all i know is you have to find the perfect square first

Answer 4

do you need the whole question to answer it
?

Answer 5

'h' represents the height of the ball from the ground - correct?

Answer 6

yes

Answer 7

so, what do you think 'h' will be when the ball hits the ground?

Answer 8

actually i have a better question if you have an equation h= -0.0425d^2 + 3.75d at a horizontal distance of 20m from the vertex, what is the height of the arch, to the nearset tenth
the horizontal distance is d and h is the height the question is talking about a arch