Annual profit in thousands of dollars is given by the function ...

 Annual profit in thousands of dollars is given by the function, P(x) = -.1x2 + 50x - 300, where x is the number of items sold, x ≥ 0.
1. describe the meaning of the number -.1 in the formula
2. describe the meaning of the number -300 in the formula
3. find the profit for 5 different values of x
4. graph the profit function over its given domain; use the 5 values calculated in part 3 to construct the graph and connect these points with a smooth curve in Excel or another graphing utility. Insert the graph in a Word file and attach the graph in a Word file to the class DB thread.
5. will this profit function have a maximum, if so, what is it?
6. what steps should the company take to prepare for your answer to part 5?