For the additive inverse you have to flip the sign of the whole problem so 10(x^2 – 7x) becomes –10(x^2 – 7x). For the multiplicative inverse you take the whole problem and put it under 1 in a fraction.
22 because 6 inches on top and bottom means you need 12 inchesw each drape and you have 4 drapes so 48 inches therefor rounding that you get 1 yard each added onto the 8 feet and 5 feet for each drape.
