Need help figuring out this problem i have attached a snip it of the problem please show all work.

{a} Suppose the total prot of a company is y = P(x) thousand dollars when m units of an item are sold. 1. What does w 2. What does Pr [:3] measure, and what are the units? 3. Suppose that P' (30) = 5, what is the approximate change in prot if the number of items sold increases from 30 to 31? for 0