Please show the full question. I would love to help
Answer:

Explanation:
A circle whose center is
and radius
, has equation:

The center of circle is given as origin
, therefore:

This circle passes
, then the radius of circle is the distance
between origin
and 

=> 
Substitute
,
, and
back into original equation:

or

Hope this helps!
:)
Answer:
8.7
Step-by-step explanation:
8.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.78.7
1.1, 0.10299, 0.1038, 0.9 im pretty sure