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(6+3)+21=6+(3+21) name each property of addition or multiplication
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On a string instrument, the length of a string varies inversely as the frequency of its vibrations. an 11-inch string has a frequency of 400 cylces per second. find the frequency of a 10-icnch string.
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(6+3)+21=6+(3+21) name each property of addition or multiplication...
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