Which expressions can be used to find the coordinates of the midpoint of line segment P Q with endpoints P 3 comma negative 1 and Q negative 7 comma negative 6 ? Choose three correct answers.

The midpoint coordinates are the averages of the corresponding endpoint coordinates: x = (3 + (−7))/2 = −2 and y = (−1 + (−6))/2 = −7/2. Choice A gives (−1 − 6)/2 = −7/2, and choice D gives (−5/2) − 1 = −7/2. Choice E gives ½(−7 − 3) + 3 = −2. Choice B omits the negative sign on −7, while choice C does not give the correct y-coordinate.

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