determine the equation of quadratic function which passes through the points (0,11 ), (3,11) and (5, 81)

Please answer this within 30 mins ! I will upvote !

A diver is standing on a platform 28 feet above a pool. Their jump to the pool can be represented by the equation \displaystyle h=-16t^{2}+6t+28h=−16t2+6t+28 , where his their height above the water, and t is the time (Decimals are okay!).What is their maximum height? (Round your answer to the nearest tenth)

the graph of a Quadratic function is shown 2a. find the equation of the quadratic function in the form y=ax^2+bx+32    2b. write down the equation of the axis of symmetry