Sam hits a golf ball. The golf ball's height is modeled by the equation below where h(t) is the height in feet and t is the time in seconds after the golf ball is hit. What is the maximum height of the golf ball? Write your answer as a decimal.

Answer asap and if you do you will get brainliest. catherine buys a gallon of ice cream from the store. after taking it home, she eats a fifth of a gallon of ice cream. her sister eats some of the ice cream as well. if two-thirds of the original amount of ice cream is left, then what fraction of a gallon of ice cream did her sister eat?