Question

Which numbers belong to the range of the revolution {(4,-1),(-7,2),(1,2),(2,1)}

Answer 1

1.
The range are y's. The y's in {(4,-1),(-7,2),(1,2),(2,1)} are -1,1,2 ⇒ A,B,C

2.
The domain are x's. The x's in {(4,-1),(-7,2),(1,2),(2,1)} are -7,1,2,4 ⇒ A,B,D