I forgot how to solve this grade 11 review package question

5) A graph representing the vertical height in metres after t seconds, has been modelled by the equation f(t)= -4.9t^2+6t+0.5.

a) how long is the ball in the air?
b) when does the ball reach its maximum height?
c) what is the maximum height?

*** If you can even provide a website that has similar solutions, it would be very helpful, THANK YOU SOO MUCH!!***

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