3. The total cost (in millions of dollars) of producing x thousand units of an item is C(x)- 4(x- 1) + 4 a. Make a well-labeled graph of C(x), x20 b. The revenuc (in millions of dollars) from selling x thousand units of the item is R(x) = 10x. What does this tell you about the price of cach unit? c. Profit is revenue minus cost. For what valucs of x do they break even (when the profit is zero)?