1. The problem statement, all variables and given/known data 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 = 6.00t 0.8 - 3.35t + 23.00, with t 0, m in grams, and t in seconds. (a) At what time is the water mass greatest? (b) What is that greatest mass? (c) In kilograms per minute, what is the rate of mass change at t = 2.00 s? (d) In kilograms per minute, what is the rate of mass change at t = 5.00 s? 2. Relevant equations The first derivative would be 4.8t^-.2-335 3. The attempt at a solution a)I set the derivative equal to zero and figured t to be 2.3375, but it says thats wrong. b)I assume I'd plug a into the original and try tht, but I can't get a. c and d)I tried to put 2 and 5 into t as the origional, but they are not right.