Question: When the ratio involves an equation, you can cancel common variables, constants, and units to create a proportionality relation, greatly simplifying the problem. For example,

When the ratio involves an equation, you can cancel common variables, constants, and units to create a proportionality relation, greatly simplifying the problem. For example, the volume of a sphere is V = (4 > 3) p R 3 so the volume is proportional to the radius cubed, or V R 3 , because 4/3 and p are constants. Sphere A has a radius twice as large as Sphere B. What is the ratio of volumes of the spheres

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