7. Complete each part of the problem. (a) Find the cost function if marginal cost, MC = - 8. 10 2x+100 with the fixed costs of $500. (b) The population of a country is predicted to be P(x) = 5.7e0.005t million, where t is the number of years after year 2010. Find the average population between the years 2010 and 2030. (GC) Use a graphing calculator to evaluate the definite integral Sex ln x dx. Round the answer to 4-decimal places. (Do not show any work. 5 points)

7. Complete each part of the problem. (a) Find the cost function if marginal cost, MC=2x+10010 with the fixed costs of $500. (b) The population of a country is predicted to be P(x)=5.7e0.005t million, where t is the number of years after year 2010. Find the average population between the years 2010 and 2030. 8. (GC) Use a graphing calculator to evaluate the definite integral 25exlnxdx. Round the answer to 4-decimal places. (Do not show any work. 5 points)