The number of milligrams of a drug in a person\'s body after t hours is given function N(t) = 18 middot e^-04t a) Find the amount of the drug after 5 hours. (Include units and round to two decimal places) b) When will the amount of the drug be 0.3 milligram? (Include units and round to two the nearest whole number) Represent the expression as a single logarithm with the coefficient 1. Simplify your Solution 1) N(t) = 18e^(-0.4t) t = 5hrs ; N(5) = 18e^(-0.4*5) = 18*0.135335 = 2.46 mg 2) 0.3 = 18e^(-0.4t) 0.3/18 = e^-0.4t Take natural log on both sides: ln(0.3/18)/-0.4 = t t= 10.235 = 10.24 = 10 hrs.