Simplify the equation. will give brainliest

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.

Ineed to know the answer to this algebra question.

Solve for x: 5/3 x = 20/21 it's fraction. remember to simplify your fraction