Math
posted by Morgan .
A baseball player hits a pitch when the ball is 2 feet off the ground. Two hundred feet from the plate, the ball reaches its maximum height of 82 feet. Will the ball clear the home run wall that is 10 feet high and 380 feet from home plate?

The equation below models the height in feet, h, of a softball t seconds after it is hit by a batter.
mc0231.jpg
Why is the height of the ball a function of time?
Each value of time is associated with exactly one height.
Each height of the ball is associated with exactly one moment in time.
There is exactly one time at which the maximum height is attained.
There is a maximum and minimum height that the ball can reach. 
There is a maximum and minimum height that the ball can reach.

Which equation is a function of x?