A formula is an equation that expresses a relationship between measurements.
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nCr = nPr/r!
A ratio expresses the relationshp between two quantities.
type the equation that shows the relationship between the variables in this chart.
A straight line graph - is one possible answer.
It doesn't. But you can calculate the ratio (relationship) between any two measurements you can make on the table. Such measurements might be (among others): * Its length * Its width * Its diagonal * Its area * Its height * Its perimeter