The area, A, of a rectangle is 120x2 + 78x – 90, and the length, l, of the rectangle is 12x + 15. Which of the following gives the width, w, of the rectangle?

The width is the area divided by the length. Dividing 120x² + 78x − 90 by 12x + 15 gives 10x − 6: multiplying them gives 120x² + 78x − 90. Therefore, the width is 10x − 6, choice C.

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