1 . Suppose $5,400 is invested in an account at an annual interest rate of 3.9% compounded continuously. How long (to the nearest tenth of a year) will it take the investment to double in size?
2 Let f(x) =x2 −14x + 40.
(a) Find the vertex.
(b) State the range of the function.
(c) On what interval is the function increasing
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