If–1 is a root of f(x), which of the following must be true?
O A factor of f(x) is (x - 1).
O A factor of f(x) is (x + 1).
O Both (x - 1) and (x + 1) are factors of f(x).
ONeither (x - 1) nor (x + 1) is a factor of f(x).

Paula makes stained-glass windows and sells them to boutique stores. if her costs total $12,000 per year plus $4 per window for the frame. how many windows must she produce to earn a profit of at least $48,000 in one year if she sells the windows for $28 each? 1. define a variable for the situation. 2. write an inequality that represents her profit. note: revenue is money coming in. cost is money going out. profit is the difference between the revenue and the cost. in other words: revenue - costs profit 3.using words, describe how many windows she must sell to have a profit of at least $48,000.