Please help me.

8. Say we have a profit maximization problem as in exam 2 where n = 2 (two factors), and f(x) = \\TI + \\72. Show the factor demands a"(p, 0, r) are increasing in (p, 0) for a fixed r and decreasing in r for a fixed (p, 0) via a Topkis-Veinott argument. In addition, show the profit exists and is finite when p > 0,0 > 0, and r > > 0