Question

Help for a medal and fan please?!?!

Answer 1

The graph below shows a company's profit f(x), in dollars, depending on the price of pencils x, in dollars, being sold by the company:

graph of quadratic function f of x having x intercepts at ordered pairs negative 0, 0 and 10, 0. The vertex is at 5, 160

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: If at one time the profit of the company was at least $100, what domain could possibly produce this profit?

Part C: What is an approximate average rate of change of the graph from x = 2 to x = 5, and what does this rate represent?

I already have part A done, so if someone could help me with part B and C, I would appreciate it!