Please, someone, help me with this problem

Write 17/20 as a decimal and as a percent.

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.

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1