Question

A baseball is throw from the top of a building and falls to the ground below. Its path is approximated by the relation h= -5t^2 +5t +30, where h is the height above ground in meters and t is the elapsed time in seconds.
a. How tall is the building/
b. when does the ball reach its maximum height?
c. How high above the building is the ball at its maximum height?

Where do I start?
You must be studying parabolas to have this type of question.
You must have learned how to find the vertex of a parabola

find the vertex (t, h)
the t is the time when you reach the maximum height
the h is the maximum height obtained.

as to the height of the building, let t = 0

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