The graph below shows a company profit f(x), in dollars depending on the price of pens x, in dollars, being sold by the company:
Graph the quadratic funcation f of x intercepts at ordered pairs 0,0 and 8,0 the vertex is at 4, 270
Part A: what do the x Intercepts and maximum value of the graph represent, what are the intervals where the funcation is increasing and decreasing, and what do they represent about the sale and profit
B: what is an approximate average rate of the change of the graph, from x=4 to x=7 and what does this relate represent