Use the substitution method to solve the system of equations. Choose the correct ordered pair.
y = 7x + 8
y = x + 20
O A. (3, 29)
B. (7,8)
O C. (2,8)
O D. (2,22)

Aball is thrown from a height of 139 feet with an initial downward velocity of 15 ft/s. the ball's height h (in feet) after t seconds is given by the following. h=139-15t-16t^2 how long after the ball is thrown does it hit the ground? round your answer(s) to the nearest hundredth. (if there is more than one answer, use the "or" button.) t =