Answer:
Step-by-step explanation:
1. As x approaches zero from the right, the line representing f(x) approaches 0. As x approaches zero from the left, the line representing f(x) approaches -4 (this is the answer to the 3rd part). These two limits are different, so the limit as x approaches zero is said to be "does not exist."
2. The line representing f(x) approaches 1 as x approaches 1 from the right. The limit is 1.
3. See 1. above. The limit is -4.
