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Y=(x+3)(x-4)(x+1)^2 sulutions? multiplicity?

Julie goes to the sports store and spends $40.50 before tax. she buys a pair of shorts for $21.75 and 3 pairs of socks that each cost the same amount. how much does each pair of socks cost? $$

What is the sum of these mixed numbers 4 2/3+ 3 1/9