A ball is thrown into the air with an upward velocity of 36ft/s. Its height h in feet after seconds is given by the function h=-16t^2 +36t +9

Question

anonymous · Answer

is the problem to find the maximum height?  or to find when it hits the ground? 
max is at $h=-\frac{b}{2a}$ like the last one

anonymous · Answer

you neglected to write the question, but because your last question involved the vertex i assumed that this one probably does as well

anonymous · Answer

ok

anonymous · Answer

sorry: A. In how many seconds does the ball reach its maxium height? 
          B. What is the maximum height?