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10. (20pes) A person drinks a cup of coffiee with 120 mg of caffeins. Each hs used to estimate the in the persons system decreases by about 18%. The exponential decay function A)- 120e amount of the caffeine t hours after it was consumed. a) How much caffeine is left after 5 hours? Round the answer to the nearest whole number. In how many hours the amount of caffeine is reduced to 15 mg? Round the answer to the nearest whole number. b) (20pts) An initial investment of$20,000 earns 4% interest per year compounded annually. The exponential function A(t)-20000(1.04) is used to calculate the money in the account after t years 11 a) What will the investment be worth in 15 years. Round the answer to the nearest whole number A15) acood 1.04)t b) In how many years the investment will be worth $100,000? Round the answer to the nearest whole number.
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