A dolphin jumps straight into the air during a performance. The dolphin's height y (in feet) after t seconds can be modeled by y = −16t2+24t. a. How many seconds is the dolphin in the air?

The dolphin is in the air for
seconds.

Question 2
b. The dolphin reaches its maximum height after 0.75 second. What is the maximum height of the jump?

The height of the dolphin is
feet (above water level) at 0.75 second.
pls giv me an answerr