Either table a or table b shows a proportional relationship. table a x 1 2 3 4 y 2 4 6 8 table b x 2 4 6 8 y 4 6 8 10 plot all the points from the table that shows a proportional relationship.

After t seconds, a ball tossed in the air from the ground level reaches a height of h feet given by the equation h = 144t-16t^2. after how many seconds will the ball hit the ground before rebounding?