1 Sketch the region. Use the right-end sample points of the Riemann Sum with three subdivisions to approximate the integral. Calculate the exact area under the curve. f5( l+x2)dx O a. A car purchased at $18,000 depreciates 5% each year. If P,, is the value of the car n after n years, find a formula for P . What does the value of the car approach over time?b. Suppose a 600 mg dose of a drug is injected into a patient and that the patient's kidneys remove 20% of the drug from the bloodstream even;I hour. Let D( n) denote the amount of drug left in the body after n hours. Find an expression for D. How long will it take for the drug to drop below 200 mg? 3 If you deposit $100 at the end of every month into an account that pays 3% interest per year compounded monthly, the amount of interest accumulated after n months is 1.0025" 1 _ _ n) I\" = \"M 0.0025 a. Find the first six terms of the sequence. b. How much interest will you have earned after two years