C is correct because the first point is on 0
Answer:
The focus is: 
Step-by-step explanation:
Given

Required
Determine the focus
The focus of a parabola

is:

So, we have:

Cross multiply

Rewrite as:

Rewrite as:

Express 8 as 4 * 2

By comparison with: 

So, the focus
is:


Answer:
-20 divided 5 is the right answer.
Your welcome!
Step-by-step explanation:
It depends on what your looking at
nevermind about my answer then oops