Solve for the width in the formula for the area of a rectangle. | Use the rewritten formula to find the width of a rectangle with an area of 42 square inches and a length of 16.8 inches.

The area formula is A = l × w. Divide both sides by the length to get w = A/l, which is choice D. Substituting the given values gives w = 42/16.8 = 2.5 inches.

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