8000-600=7400
7400 would be the new altitude using simple subtraction.
It is not true that line a intersects MN at the end point of MN.
The end points of MN are M and N. But given tha line a is a bisector of MN, then line a intersects MN at the midpoint of MN, and thus MN is splited into two congruent segments.
Answer:
S
Step-by-step explanation:
Answer: A
Step-by-step explanation: