The mass m of the H2O is given as a function of time t by m = 4.6t0.8 - 2.8t + 20, with t ≥ 0, m in g, and t in secs.
(a) At what time is the H2O mass greatest, and (b) what is that greatest mass? In kg/min, what is the rate of mass change at (c) t = 2.3 s and (d) t = 5.0 s?