The graph below shows a company's profit f(x), in dollars, depending on the price of goods x, in dollars, being sold by the company: f(x) 150 120 90 60 30 х 1 2 + 5 6 7 3 4 8 -3 -2 -1 -30 Part A: What do the x-intercepts and maximum value of the graph represent? Part B: What are the intervals where the function is increasing and decreasing, and what do they represent about the sale and profit? Part C: What is an approximate average rate of change of the graph from x = 1 to x = 3, and what does this rate represent? Please help, I think I have an idea but I'm not sure. Will mark brainliest. ​