please solve for a

Watch the video that describes finding and analyzing cost, revenue, and profit. Click here to watch the video. If x represents the number of items produced, (a) write a cost function, (b) find a revenue function if each item sells for the price given, (c) state the profit function, and (d) determine analytically how many items must be produced before a profit is realized (assume whole numbers of items). The fixed cost is $700, the cost to produce an item is $20, and the selling price of the item is $45. (a) The cost function is C(x) = (Simplify your answer. Do not factor.)