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 of a rectangle is A = l × w. Solve for width by dividing the area by the length: w = A ÷ l = 42 ÷ 16.8 = 2.5 inches. Therefore, the width is 2.5 in., choice A.

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