Answer:
<h2>(1, -2)</h2>
Step-by-step explanation:
The equation of a circle:

(h, k) - center
r - radius
We have:

Answer:
it defines an important concept of standard deviation used in probability theory and statistics. It has a major use in the formula for roots of a quadratic equation; quadratic fields and rings of quadratic integers, which are based on square roots, are important in algebra and have uses in geometry.