A company's profit can be modeled by the equation p(u)=-u^2+180u+1000 where 'u' is the number of units sold. Find the maximum profit of the company. How many units should the company sell to maximize profit? (Hint: set your window to xmin=-20 xmax=200 to see the sides of the parabola then adjust your ymax to see the vertex of the parabola.)