P, in thousands of dollars, that a manufacturer makes is a function of the number N of items produced in a year, and the formula is P=-0.2N2+3.6N-9 1-Express using function notation the profit at a production level of 5 items per year, and then calculate that value. 2- Determine the two break-even points for this manufacturer that is, the two production levels at which the profit is zero. 3- Determine the maximum profit if the manufacturer can produce at most 20 items in a year