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Algebra
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OpenStudy (anonymous):
*Systems with Three variables applications (help please with the steps I got most of it) -Jonathan and members of his Spanish club are going to Costa Rica over spring break. Before his trip, he purchases 10 travelers checks in denominations of $20, $50,$100, totaling $370. He has twice as many 20 checks as $50 checks. How many of each type of denomination of travelers checks does he have?
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OpenStudy (anonymous):
I don't know what z is
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