What's the square root of 1/961 if you answer

An objects motion is described by the equation d= 4sin (pi t) what will the height of the object be at 1.75 seconds?

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?

Is the figure congruent? yes or no?