SOLUTION: A ball is thrown into the air with an upward velocity of 48ft/s it's high eight in feet after T seconds is given by the function h=-16t^2+48x+6. How long does it take the ball to

If a projectile is thrown into the air with an upward velocity of
v0, its height in feet after t seconds is given by the function 

   ht = -16t2+v0x+h0. 

to find the time when it reaches its maximum height, use the
vertex formula:

         t = -b/(2a) or -v0/(2*-16)

to find the maximum height, substitute that value of t into

   ht = -16t2+v0x+h0 

Edwin