What is the complete question and what are the choices??
Given a point in coordinates form

, one can compute the cartesian form like this:

We have:

We get the cartesian form then:
<span>31 trillion kilometers or 19 trillion miles.</span>
3a.
Explanation:
the mean, first of all, is the average. so, you need to find the average between 2 ans 4 since it has the same label. 2+4=6. 6/2=3
Answer: 3a