A Biologist Measures the Amount of Contaminant in a Lake $Q$

Short Answer

A biologist measures the amount of contaminant in a lake 2 hours after a chemical spill and again 11 hours after the spill. She sets up two possible models to determine $Q$ , the amount of the chemical remaining in the lake as a function of $t$ , the time in hours since the spill. The first model assumes the contaminant is leaving the lake at a constant rate, which she determines to be 3 tons\hour. Using this model, she estimates that the lake will be free from the contaminant 20 hours after the spill. Thus, Q(2)= ---------- and Q(11)= ----------- The second model assumes that the amount of contaminant decreases exponentially. In this model, she finds that $Q(t)=\ldots(\ldots)^{t}$ . Round both answers to 3 decimal places.