You can
put this solution on YOUR website!describe the combined variation that is modeled by each formula.
V=lwh
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I've never hear of combined variation but here goes:
V and l, or V and w, or V and h are all directly related;
when one goes up the other goes up.
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l and w, or l and h, or w and h are all indirectly related;
when one goes up in value the other goes down.
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Cheers,
Stan H.
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