A comparison between two quantities., Ratio, Proportion, Direct Variation, Combined variation, Refers to the equality of two ratios., Inverse Variation, Ratio, Combined variation, Proportion, A situation ok produces pairs of numbers in which their ratio is constant., Combined variation, Direct Variation, Proportion, Ratio, A situation produces pairs of numbers whose product is constant, Ratio, Direct Variation, Proportion, Inverse Variation, Kind of variation that involves both direct and inverse variations, Direct Variation, Ratio, Inverse Variation, Combined variation

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