Answer: look at the picture
Step-by-step explanation: Hope this help :D
Radius. A circle is defined by points which are all the same distance from a point. This distance is the radius.
You re write the equation, so when the equations are added one of the variables are eliminated
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10^-3 would make a decimal, so would 10^-1.
10^1 would be 30 miles, 10^3 would be 3 with 3 zeros ( 3000 miles) which would be most accurate
7<n<8 is the right answer