Answer:
MA is the bisector
13 is the length of RS
Explanation:
RS would be the line segment
MA is what bisected or intercepted the line so it is the bisector.
9 isn't and even number if you cut it in half you would have 4 or 5. 4 is half of 9 rounded down and 5 is half of 9 rounded up.
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This looks like 4 + 5 + 4 =13. 9 Is closer to then reight than the left meaning it could be 9 cut in half rounded down, 4.