This isn't a question, even. It's a statement about a line segment, QR.
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It is: 15
10
The average equals 30. So 10
The halfway point between two numbers is found by calculating the average of the two numbers. In this case, the average of -20 and 10 is (-20 + 10) / 2 = -10 / 2 = -5. Therefore, the number halfway between -20 and 10 is -5.
10