(Section 3.6) Crane Foods determines that its daily revenue, R(r), in dollars, from the sale of x frozen dinners is given by R(x) = 4x3/4 %3D (a) What is Crane's daily revenue when 81 frozen dinners are sold? (b) What is Crane's marginal revenue when 81 frozen dinners are sold? c) Use the answers from parts (a) and (b) to estimate R(82).

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