The equation of a cricle is

h being the x coordinate of the given point and k being the y coordinate of the given point (r also being the radius).
Now we have to plug the points into the equation

now just simplify the the equation
Answer:
85
Step-by-step explanation:
because A is half of that and if you divided 170 by 2 you would get 85, I think that's how you do it.
Its c.
If you will substitute those numbers to the pair of equations, both will be true.
1=-3+4
1=3-2
So base on your question where there is a set of line graph in the choices and what could be the perfect graph that could have or be fit with this sequences 1, 2.5, 4, 5.5, 7. So base on your data i conclude that the slope of the graph is 1.5 and you just need to graph it and its a slanting line that has a slope of 1.5