In a room with 10 people, everyone shakes hands with everybody else exactly once. How many handshakes take place?

To describe a sequence of transformations that maps triangle abc onto triangle a"b"c", a student starts with a reflection over the x-axis. how should the student complete the sequence of transformations to map triangle abc onto triangle a"b"c"? plz

Which shows the correct substitution of the values a, b and c from the equation 1=-2x+3x^2+1

Awasher and a dryer cost $701 combined. the washer costs $51 more than the dryer. what is the cost of the dryer?