I need help solving these economics questions, I do not know the definitions

Students need to assess their knowledge of a firm's costs by reviewing their knowledge of the definition of a firm's costs and how to calculate those costs by understanding the cost (and revenue) formulas. Students need to compile the following definitions and formula's together for this assignment. Please remember that many of these items are able to be calculated or thought of in more than one way, so be complete and thorough. For ones that have multiple ways to calculate or think of the item, please include multiple formulas or ways to calculate. . Profit . Total Revenue . Marginal Revenue . Total Cost . Marginal Cost . Fixed Cost . Average Fixed Cost . Variable Cost . Average Variable Cost Note: Some of these may have a formula explicitly stated in the textbook or on some of the videos. Some of these you may have to rearrange formulas to find or put the definition into mathematical notation. Do not let yourself be stopped just because the textbook does not have a bolded formula that says "thing Dr. Santiago wants = item 1 + item 2"