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Compare the subtraction problems 6/8 - 5/8 = 1/8 and 6/9 - 7/9 = 1/9 why is the answer to the first problem positive and the answer to the second problem negative

If f(x) =3x-2 and g(x) =2x+1 fins (f+ g) (x)

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?