In regular algebra, addition and multiplication are commutative : $$A + B = B + A$$ $$A \times B = B \times A$$ they are also associative : $$A + (B + C) = (A + B) + C$$ $$A \times (B \times C) = (A\times B) \times C$$ And multiplication is said to be distributive : $$A \times (B + C) = (A \times B) + (A \times C)$$.
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Many public libraries in Lancaster County have a book shop that is open year round. True. Check with your local public library if they have a library book shop. In fact, the Lancaster Public Library also has an off-site book store at 225 North Marshall Street in Lancaster.