Exponential and Logarithmic Functions

Suppose that $2200 is invested at an interest rate of 1.5% per year, compounded continuously. After how many years will the initial investment be doubled? Do not round any intermed'ate computations, and round your answer to the nearest hundredth. [D years X a A sample of a radioactive substance has an initial mass of 673.1 mg. This substance follows a continuous exponential decay mode! and has a halflife of 9 days. (a) Let: be the time (in days) since the start of the experiment, and let _ IHnlI y be the amount of the substance at time I. Write a formula relating y to I. X 53 Use exact expressions to ll in the missing parts of the formula. Do not use approximations. y : DJIII}? (b) How much will be present in 3 days? Do not round any intermediate computations, and round your answer to the nearest tenth. 1mg