Q3 In economic analysis, functions are often given in general rather than specific form, meaning that there is no numerical specification. If average revenue, AR, is a function of Q, that is AR=f(Q), and TR=ARQ, where TR is total revenue, find the derivative of the total revenue function (that is, marginal revenue). Q4 Differentiate f(x)=3x8/3 three times. Show that the third derivative of this function cannot be evaluated at x=0