For the demand function q = D(x) = 400 find the following. a) The elasticity b) The elasticity at x = 7, stating whether the demand is elastic, inelastic, or has unit elasticity c) The value(s) of x for which total revenue is a maximum (assume that x is in dollars) a) Find the equation for elasticity. E(x) =| b) Find the elasticity at the given price, stating whether the demand elastic, inelastic, or has unit elasticity. E(7) = (Simplify your answer. Type an integer or a fraction.) Is the demand at x =7 elastic, inelastic, or does it have unit elasticity? O A. elastic O B. unit elasticity O C. inelastic c) Find the value(s) of x for which total revenue is a maximum (assume that x is in dollars). O A. $ (Round to the nearest cent as needed. Use a comma to separate answers as needed.) O B. The total revenue is independent of x.

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. d) Calculate the year it had its minimum value: e) What was its minimum value: ✔ dollars. dollars.