Question

For each graph of a function f, determine the domain and range of f.

Answer 1

Let d = domain and r = range for short-hand purposes

13. d: [ - 4, 4] r: [- 2, 2]

14. The right most point does not have a label under it so I'm going to assume it's both a 5 and an infinity

If it's a 5 then: 
d: [ - 4, 5] r: [ - 2, 4]

If it's an infinity then: 
d: [ - 4, ∞) r: [- 2, 4]

The circles are closes meaning you include them in the function f so you must use the brackets and parentheses exactly how they are used above.