The radius is the distance from the center to any point. The distance from (2,1) to (0,1) is of course 2. The general formula for a circle with radius r and center (a,b) is

In our case we get
Answer:
Step-by-step explanation:
You are to take the square root across the inequality sign to make it plus or minus 3 squared.
The answer will therefore be C
Answer:
1 and 2
1 and 5
10 and 0.1
the last is unreadable
Step-by-step explanation:
Answer:
-2
Step-by-step explanation:
4 × -0.5 = -2