Gavin deposits money into his savings account that is compounded monthly at an interest rate of 9%. If Gavin deposited $3500, how much will Gavin have in his account in 5 years? How much money did Gavin make in interest? Could you please give a step by step explanation.

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The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 0 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)