b. Consider an investment of amount P now and receive a sequence of positive payoffs {A1, A2,...,A.} at regular intervals. Use the Mean Value Theorem to show the rate of return defined by the root of the following function is unique: f(-) = -P+34(1 +)** b. Consider an investment of amount P now and receive a sequence of positive payoffs {A1, A2,...,A.} at regular intervals. Use the Mean Value Theorem to show the rate of return defined by the root of the following function is unique: f(-) = -P+34(1 +)**