Question

1. Which of the following represents a function?

http://static.k12.com/eli/ecollege/593/1_31560/2_43444_10_31674/2987d1da9a53c8b56efae2db3519816362033631/media/8236e5d7a8b6bd3d09dc4733ad79ca8fb47334f6/mediaasset_1280849_1.jpg
2. What is the domain of the function: {(2, 1); (4, 2); (6, 3); (8, 4)}?
a. {1, 2, 3, 4}
b. {1, 2, 3, 4, 6, 8}
c. {2, 4, 6, 8}
d. {6, 8}
3.What is the range of the function: {(1, 2); (2, 4); (3, 6); (4, 8)}?
a. {1, 2, 3, 4, 6, 8}
b. {1, 2, 3, 4}
c.{2, 4, 6, 8}
d. {6, 8}