
Donald W. answered 03/10/22
Experienced and Patient Tutor for Math and Computer Science
A. Yes, it exists. It looks like f(1) = 2.
B. No, it doesn't exist because the limit as x→1 from the negative direction (7) is different from the limit as x→1 from the positive direction (1).
C. No, it doesn't exist because there is just a hole there.
D. Yes, it exists because the limit as x→6 from the negative direction is the same as the limit as x→6 from the positive direction, name 2.