A ball is thrown vertically upward. After t seconds, its height h, in feet, is given by the function h (t) = -16t^2 + 64t. How many seconds will it take the ball to reach its maximum height?

a

step-by-step explanation:

i need the pts ignore this answer

the answer is d

the answer is in the first quadrant, which make the y-int positive.

since the dots are going down, therefore the correlation is negative

i hope it is right.

yx = 36

step-by-step explanation:

cos f = opposite side/ hypotenuse

cos f = yw / yx

we know cos f = 4/9 and yw =16

4/9 = 16/yx

multiply each side by yx

4/9 yx = 16/ yx * yx

4/9 yx = 16

multiply each side by 9/4

9/4 * 4/9 yx = 16 *9/4

yx = 36