math
posted by nina .
a ball is thrown upward at 64 feet per second from the top of an 80 feet high building. The height of the ball can be modeled by S(t) = 16t^2 + 64t + 80(feet), where t is the number of seconds after the ball is thrown. describe the graph model

graph of what? Position vs time?
It will be a parabola, starting on one side at t=0 v=64
The velocity slows to zero, then goes negative until the end. 
you throw a tennis ball upward from a height of 4 feet with an initial vertical velocity of 36 feet per second.
a. write an equation that models the height h (in feet) of the tennis ball as a function of the time t (in seconds) after its thrown.
b. does the ball reach a height of 30 feet? explain.