Assume that the following has a linear cost function. Find the cost function, C(x), revenue function, R(x), and profit function, P(x), where x is the number of items produced (or sold).

FixedCost	MarginalCost	ItemSellsfor
$300	$18	$30

What is the cost function? C(x)equals=________ (Simplify your answer. Do not include the $ symbol in your answer.)

What is the revenue function? R(x)equals=_______ (Simplify your answer. Do not include the $ symbol in your answer.)

What is the profit function? P(x)equals=_________ (Simplify your answer. Do not include the $ symbol in your answer.)