Timed unit what is the value of x? a) x=2.25 b) x=11.25 c) x=13 d) x=22

Can someone check if i did this correct. it’s number 4 if you’re wondering.

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?

Consider that lines b and c are parallel. what is the value of x? what is the measure of the smaller angle?