The graph below shows a company's profit f(x), in dollars, depending
on the price of erasers x, in dollars, being sold by the company:
300 + f(x)
270
240
210
180
150
120
90
60
30
--3-2-1
- it
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? (6 points)
Part B: What is an approximate average rate of change of the graph
from x = 1 to x = 4, and what does this rate represent? (4 points)