3) Find the volume ofthe solid 5 formed by rotating the region under the curve {(x) : (x + If. 6 pts. the X-EIXlS. and the lines x = 0 and x = 2. Write formula down. Answer with the exact solution {NOT an approximation}! 4) A patient is injected with a drug. and t hours later. the concentration of the drug remaining in the patients 7 pts. bloodstream is given by 0 3t (t2 + l6} Ill What is the average concentration of the drug the first 3 hours atter the injection? Write the formula down. Explain your work and answer with a complete sentence. ca) : 3 mgr'cm A a - A b