Question

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

Choose all the that are correct
A 2
B 1
C -1
D -7
Which numbers belong to the domain of the revolution {(8,-5),(4,2),(4,8),(-7,6)}

A 4.
B 2
C -5
D -7

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