PLEASE HELP!

To hit a ball over a tree a golfer hits the ball with a path that is modeled by h=-16t^2+80t where (h) is the height in meters and (t) is the time in seconds. Determine
Part A: The height of the ball after 1 second

Part B: The time it takes the ball to reach it's maximum height'

Part C: The Maximum height of the ball

Part D: The time it takes for the ball to return to the ground.

Bella want to know what the students at her school think of her show. which is the best group to survey to find this information a. go to the mall and ask all of the students she recognizes from school b. ask her viewers to call in durning an episode of the show c. get a list of students at her school from the office and use a random number generator to pick 30 of them d. get a list of students at her school from the office and pick the first 30 students on the list