−1.2b−5.3≥1.9 can someone me solve this!

How do i do this activity, is appreciated

Points a, b, and c form a triangle. complete the statements to prove that the sum of the interior angles of triangle abc is 180

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?