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 formula for the area of a rectangle is:

Area = length * width

To solve for the width, we rearrange the formula to isolate the width:

width = Area / length

Now, substitute the given values into the formula:

width = 42 / 16.8
width = 2.5 inches

Therefore, the width of the rectangle with an area of 42 square inches and a length of 16.8 inches is 2.5 inches.