In mathematics, a formula is a(n)

A.

expression of the value of the quantity.

B.

procedure for calculating area and perimeter.

C.

equation with three or more unknown quantities.

D.

rule for finding an unknown quantity

In mathematics, a formula is a(n)

A.

expression of the value of the quantity.

B.

procedure for calculating area and perimeter.

C.

equation with three or more unknown quantities.

D.

rule for finding an unknown quantity

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I would say that it is a rule for finding an unknown quantity as we use formulas to find answers.