a) Algebraically, determine when the concentration will higher than 5 mg/L .You must provide a complete interval chart in your solution. Estimate the instantaneous rate of change of P(t) at t = 5s. 6). The concentration of a drug ,c, of a drug in the bloodstream t hours after the drug was taken is \text { given by } c(t)=\frac{50 t}{t^{2}+7} \quad \text {, where } c \text { is measured in milligrams per litre. Time } t>0 \text {. }

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