could someone possibly explain this and help me work through it. ? please?
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? (5 points)
Part B: If at one time the profit of the company was at least $120 what domain could possibly produce this profit? (2 points)
Part C: What is an approximate average rate of change of the graph from x = 1 to x = 4, and what does this rate represent? (3 points)
im not sure on how exactly to do it

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