50 POINTS!!!!!
The graph below shows a company’s profit f(x), in dollars, depending on the price of the erasers x, in dollars, being sold by the company:
Part A: What do the x intercepts and maximum value of the graph represent? What are the intervals where the function is increasing and decreasing, and what do they represent about the sale and profit?
Part B: What is the approximate average rate of change of the graph from x=1 to x=4, and what does this rate represent?