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Message: <blockquote data-quote="tcarbone93" data-source="post: 1584408" data-attributes="member: 603495">can pick up how to do this? Cruzin Boards has found that the cost, in dollars, of producing x skateboards is given by C(x)=900+18x^0.7 The revenue from the sale of x skateboards is given by R(x)=75x^0.8 A) Find the average profit when 20 skateboards have been biult and sold.B) Find the rate at which the average profit per skateboard is changing when 20 skateboards have been built and sold.</blockquote>