When I used my calculator to compute 20*pi, I get approximately 62.83185
This is somewhat close to what choice C is saying. The difference is that choice C has an extra 1 buried inside it. I'm not sure if your teacher made a typo.
H=0 Therefore: 144t-16t²=0 t (144-16t)=0 We have two equations: 1) t=0 (when the ball is released) 2) 144-16t=0 -16t=-144 t=-144 / -16=9 (this is the time )