Question 109868This question is from textbook Beginning and Intermediate Algebra
: In football, the hangtime of a punt is how many seconds after it's kicked that the ball returns to ground level. The height of one particular punt is given by:
y=-16x2 +80x
where y is in feet, and x is secinds after the puntWhich intercept tells us the hang time of the punt, and what is it?
*x-intercept: 0 seconds
*x-intercept: 5 seconds
*y-intercept: 5 seconds
*y-intercept: 3 seconds
This question is from textbook Beginning and Intermediate Algebra
Answer by ankor@dixie-net.com(22740)   (Show Source):
You can put this solution on YOUR website! In football, the hangtime of a punt is how many seconds after it's kicked that the ball returns to ground level. The height of one particular punt is given by:
y =-16x2 + 80x
where y is in feet, and x is seconds after the punt Which intercept tells us the hang time of the punt, and what is it?
*x-intercept: 0 seconds
*x-intercept: 5 seconds
*y-intercept: 5 seconds
*y-intercept: 3 seconds
:
When the ball hits the ground y = 0
-16x^2 + 80x = 0
Simplify, factor out -16x, (also changes the signs)
-16x(x - 5) = 0
x = +5 seconds hang-time (x intercept of course)
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