A biologist measures the amount of contaminant in a lake four hours after a chemical spill and again 12 hours after the spill. She sets up two possible models to determine Q, the amount of chemical remaining in the lake as a function of t, the time in hours.
a. In the first model, she assumes that the contaminant is leaving the lake at a constant rate of 5 tons/hour and that the lake will be free of contaminant 30 hours after the spill. Based on this model, find Q(t), the quantity (in tons) of contaminant remaining in the lake as a function of time. What the amounts measured at 4 & 12 hrs?

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