### Home > INT2 > Chapter 9 > Lesson 9.3.1 > Problem 9-85

To avoid a sand trap, a golfer hits a ball such that its height is represented by the equation , where

*is the height measured in feet and*

*is the time measured in seconds. .*

When does the ball land on the ground?

Substitute

for to find how long it takes for the ball to land on the ground.. Solve by factoring.

orrepresents when the ball was on the ground before it started flight; therefore, it tookseconds for it to land after its flight. What is the maximum height of the ball during its flight?

Assume that the ball would be highest exactly halfway through its flight.

Knowing this information, substitute half of the total time it took the ball to land for*t*and solve for.

What domain makes sense for modeling this situation?

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