Which set of ordered pairs (x, y) could represent a linear function? A = {(-2,-4), (0, -2), (2,0), (4,3)}
B = {(-6,5), (-4,2), (-1, -1), (2, -4)}
C = {(0,9), (1,7), (2,5), (3, 2)}
D = {(-3,-1), (1,1), (5,3), (9,5)}

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.