The line that is horizontal on a graph
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Answer:

Step-by-step explanation:
The equation of a circle is given by:

Where (h, k) is the center and r is the radius.
The center of the circle is (1, -4).
And the radius is 3.
Substitute:

Simplify. Thus, our equation is:

Answer: Look at my attached example.
Hopefully this helps with converting units.
Rounded to the nearest tenth would remain is 8.2 units is the answer. Just took the test.