Help , thank you for helping me​

If f(x) = 2x + 2 and g(x) = x? , what is (gºf)(2)?

At which value in the domain does f(x) =0?

The height of a flare fired from the deck of a ship in distress can be modeled by h(t)= -2(8t^2-52t-28), where h is the height of the flare above water and t is the time in seconds. a. find the time it takes the flare to hit the water.