answer these three questions. there are 3 images attached below and they apply to each question, in order.
1)
a) is this a function? why or why not?
b) what is the domain?
c) what is the range?

2)
a) is this a function? why or why not?
b) what is the domain?
c) what is the range?

3)
a) is this a function? why or why not?
b) what is the domain?
c) what is the range?

1. a. Yes. Every point in the domain maps to only one point in the range.
1. b. Presumably, all values of belong to the domain.
1. c. As the graph depicts, the function takes on all values greater than and including , i.e. .

2. a. No. For all , there are two values in the range that maps to. For instance, when , we have, approximately, .
2. b. All .
2. c. All .

3. a. No. When , we have .
3. b. Assuming each point shown on the plot are all the points, then the domain is .
3. c. .