What is the area of a rectangle with vertices (–1, –4), (–1, 6), (3, 6), and (3, –4)?

The rectangle’s horizontal side runs from x = −1 to x = 3, so its width is 3 − (−1) = 4 units. Its vertical side runs from y = −4 to y = 6, so its height is 6 − (−4) = 10 units. The area is 4 × 10 = 40 square units, so the correct choice is 40 square units.

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