A vertical line segment has endpoints J(–4, 5) and K(–4, 1). What is the midpoint?

To find the midpoint, average the x-coordinates and the y-coordinates separately. The x-coordinate is (−4 + −4) ÷ 2 = −4, and the y-coordinate is (5 + 1) ÷ 2 = 3. So the midpoint is (−4, 3), choice B.

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