Page 5 5 > 19. The formula h = -16t? + vot is used to model the height of a ball, in feet, from the ground level t seconds after it is thrown upward. In the formula, V, represents the initial velocity of the ball. How fast would the ball have to be thrown upward to reach a maximum height of 121 feet? Give your answer in feet per second (ft/s). 20. Find the equation of the circle and the tangent line shown in the xy-plane below. (-5,12)