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12. A quantity $Q$ satisfies the differential equation $dtdQ?=Qt??0.5.$ (a) If $Q=8$ when $t=2$, use $dQ/dt$ to determine whether $Q$ is increasing or decreasing at $t=2$. (b) Use your work in part (a) to estimate the value of $Q$ when $t=3$. Assume the rate of change stays approximately constant over the interval from $t=2$ to $t=3$.