Write the Word or Phrase That Best Completes Each Statement $y = C ( x )$

Short Answer

Write the word or phrase that best completes each statement or answers the question.
Provide the missing information.
-Suppose that $y = C ( x )$ represents the cost to produce $x$ items, and that $y = R ( x )$ represents the revenue for selling $x$ items. The profit $P ( x )$ of producing and selling $x$ items is defined by $P ( x ) =$ .