Question

Question 11 3 pts If $4,500 is invested at an annual rate of 8% compounded continuously, the future value at any time tin years) is given by S = 4,500e0.086, How long does it take for the investment to double? Round your answer to one decimal place. 8.7 years O 11.7 years 7.4 years O 9.0 years 8.6 years Question 12 3 pts The securities industry experienced dramatic growth in the last two decades of the 20th century. The following models for the industry's revenue R and expenses or costs (both in billions of dollars) were developed as functions of the years past 1980 with data from the U.S. Securities and Exchange Commission's 2000 Annual Report (2001). R(t) = 21.40.1311 and C (t) = 18.6e0.1314 Use the models to predict the profit for the securities industry in 2009. Round your answer to two decimal places. $830.61 billion $1.15 billion $540.34 billion O $955.65 billion O $125.04 billion