Short calculus problem dealing with cost rev and profit?

[chunker7]

Let C(q)represent the cost, R(q)the revenue, and ?(q) the total profit, in dollars, of producing q items.

If C'(93)=94 and R '(93)=100, approximately how much profit is earned by item # 94?

If C '(95)=111 and R '(95)=86,approximately how much profit is earned by item # 96?

could some one show me please how to solve these

 

[tkhunny]

?(q) = R(q) - C(q)

?'(q) = R'(q) - C'(q)

Now what?