## Calculus 10th Edition

a) The limit as x approaches c does not exist since the one-sided limits are not equal. b) Here the limit exists, but $f(c)$ is not defined and hence the function is not continuous. c) The limit at $x=c$ exists but is not equal to $f(c),$ hence the function is not continuous. d) The limit at $x=c$ does not exist because the one-sided limits are not equal.