A company models its net income, in thousands of dollars, with the function f(1) = 452 - 160 - 84, where x is the number of units of its product sold. How many units of its product does the company need to sell in order for the net income to equal $0?​

The length of a rectangular board is 3 feet less than twice its width. a second rectangular board is such that each of its dimensions is the reciprocal of the corresponding dimensions of the first rectangular board. if the perimeter of the second board is one-fifth the perimeter of the first, what is the perimeter of the first rectangular board?