The revenue and cost functions for the sale of a particular product are given below (where x represents number of units sold): R(x)=-x^2 +10x +15, C(x)=8x +12 a.) find the number of units that need to be sold to break even and explain its meaning b.) Find the number of units that need to be sold to maximize revenue and the value of the maximum revenue. c.) State the marginal revenue equation and then use it to confirm that the maximum revenue found in B is the absolute maximum of R(x).

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