1) The manager of a 100-unit apartment complex knows from experience that all units will be occupied if the rent is $800 per month. A market survey suggests that, on average, one additional unit will remain vacant for each $10 increase in rent. What rent should the manager charge to maximize revenue? 2) Apply the second derivative test to find the relative minimum and maximum of the function f ( x ) = - 1 OSXS2 n sin x + 4