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F(x) = (x^2 + 3x − 4) and g (x) = (x+4) find f/g and state the domain.

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.

Having a hard time understanding this question (see attachment).