The height of a pop fly ball over the time after the ball is hit is modeled by the function, h(t) = -4t^2+t+60, where h is the ball's height in feet above the ground and t is the
time in seconds after the ball is hit. Use the quadratic formula to find how many seconds it
takes for the ball to hit the ground.
(Please help.. HURRY)

3.17 scores on stats final. below are final exam scores of 20 introductory statistics students. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 57, 66, 69, 71, 72, 73, 74, 77, 78, 78, 79, 79, 81, 81, 82, 83, 83, 88, 89, 94 (a) the mean score is 77.7 points. with a standard deviation of 8.44 points. use this information to determine if the scores approximately follow the 68-95-99.7% rule. (b) do these data appear to follow a normal distribution? explain your reasoning using the graphs provided below.