The length of a rectangle is 4 units shorter than half the width. If the length of the rectangle is 18 units, which equation can be used to find w , the width of the rectangle?

Half the width is w/2. Since the length is 4 units shorter than half the width, the length is w/2 − 4. Substituting the given length of 18 gives 18 = w/2 − 4, which is choice B.

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