Question 4448
The quadratic equation to which you refer but failed to include is:

h(t) = -16t^2 + (vo)t + ho  
Where:  t is time in seconds, vo is the initial upward velocity of the object, and ho is the initial height of the object.

In this problem, the object is a baseball, which does not alter the mechanics of the situation.
  The initial upward velocity has been omitted, and the initial height of the baseball is that of the thrower or 200 ft.

The upshot (no pun intended) is that unless and until you provide the quadratic equation to which you allude or the initial upward velocity with which the baseball was propelled, a solution cannot be found.