The change in price of a certain currency is defined by the function C(x)=2x³-63.x²+408-x+26, where 3 < x < 18, represents the last 15 years and C(x) is its price (in dollars) at time x. Using Derivatives only, answer the following questions: a) What was its price at the start of this period: b) Calculate the year it had its maximum value: c) What was its maximum value: [ dollars. ✔ dollars. ✓

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