The balance B, in thousands of dollars, in a CD account at a bank is a function of time t, in years, since you opened the account, so B = f(t). (a) What does f(7) = 5 tell you? When t = we have B = What are appropriate units for t? O dollars O thousand dollars O days O years O thousand years What are appropriate units for B? O dollars O thousand dollars O days O years O thousand years (b) Is f an increasing or decreasing function of t? O increasing function O decreasing function (c) Discuss the concavity of f.

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