The owner of a mid-sized business advertises on the television and on the radio. He has found that the number of units that he sells is approximated by N(x, y) = -0.3x - 0.5y- + 6x + 1By + 270, where x (in thousands of dollars) is the amount spent on television advertising and y (in thousands of dollars) is the amount spent on radio advertising. How much should he spend on each to maximize the number of units sold? Answer 10 Points Keypad Keyboard Shortcuts on television advertising V Prev on radio advertising