Vicki ate 5/20 cookies on Friday and 15/20 last week
If you mean z to the powers given the answer will be B

Suppose we choose a path along the

-axis, so that

:

On the other hand, let's consider an arbitrary line through the origin,

:

The value of the limit then depends on

, which means the limit is not the same across all possible paths toward the origin, and so the limit does not exist.
The answer to this is D!!!!