Final answer:
The coordinate of point C, the other endpoint of line segment CO, is (5, 12.5).
Step-by-step explanation:
To find the coordinate of point C, we can use the midpoint formula. The formula is:
(x-coordinate of P + x-coordinate of O) / 2, (y-coordinate of P + y-coordinate of O) / 2
Plugging in the values, we get:
(7 + 3) / 2, (15 + 10) / 2 = (10 / 2, 25 / 2) = (5, 12.5)
Therefore, the coordinate of point C is (5, 12.5), so the answer is C) (5, 12.5).