Water is poured into a container that has a leak. The mass m of the water is given as a function of time t by m = 4.8 - 3.1t + 19, with t 0, m in...

Water is poured into a container that has a leak. The mass m of the water is given as a function of time t by m = 4.8t0.8 - 3.1t + 19, with t ≥ 0, m in grams, and t in seconds. (a) At what time is the water mass greatest, and (b) what is that greatest mass? In kilograms per minute, what is the rate of mass change at (c) t = 2.4 s and (d) t = 5.3 s?