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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 = 4.5t0.8 - 3.3t + 21, 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

d) t = 5.5 s?

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