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An individual has $45,000 to invest: $32,000 will be put into a low-risk mutual fund averaging 6.6% interest compounded monthly, and the remainder will be invested in a high-yield hound fund averaging 9.3% interest compounded continuously. (a) Write an equation for the total amount, A, in the two investments after t years. Am = dollars (b) Write the rate-of-change equation for the combined amount. (Round all numerical values to four decimal places.) A'(t) = dollars per year (c) How rapidly is the combined amount of the investment growing after 4 months? after 18 months? (Round your answers to the nearest cent.) 4 months $ per year 18 months $ per year Additional mum". El eBook