Answer:
Isabelle is correct, its enough to find each angle. We know in a triangle theres 180 degrees expecially in straight lines, in NP and PQ there is two right angles making them similar.
It is the same. Even though you put a 0 in the end can't change the number
Yes, because the sample is random. If she had chosen the participants in any way other than randomly, it would not be representative of her entire school.
The answer is (3, -5). I hope this helped