Jessica is a custodian at Oracle Arena. She waxes 20m x20 of the floor in 5/3 of an hour. Jessica waxes the floor at a constant rate.
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In chemistry, an element is a pure substance which cannot be broken down by chemical means, consisting of atoms which have identical numbers of protons in their atomic nuclei. The number of protons in the nucleus is the defining property of an element, and is referred to as the atomic number.
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