Struggling with this.

A ball is thrown into the air by a baby alien on a planet in the system of Alpha Centauri with a velocity of 44 ft/s. Its height in feet after t seconds is given by y = 44% 15:2. a.) Find the average velocity for the time period beginning when to = 3 second and lasting for the given time. t = .01 sec: t = .005 sec: t = .002 sec : t = .001 sec: b.) Estimate the instanteneous velocity when t = 3. Answer: [3 NOTE: For the above answers, you may have to enter 6 or 7 significant digits if you are using a calculator