Aball is thrown in the air from a ledge. it's height in feet represented by f(x)=16(x^2-6x-7), where x is the number of seconds since the ball has been thrown. the height of the ball is 0 feet when it hits the ground. how many seconds does it take the ball to reach the ground?

Step-by-step explanation:

Since we know that the height is 0, we can figure out how long it took the ball to reach the ground by setting and solving for :

Because time can only be positive, the answer is 7 seconds.

x+y=90

x=30-y=x

step-by-step explanation:

if you understand you will get the answer

the reporter's right

step-by-step explanation:

1/4 = .25 / 25%