What’s the question to go with the 10 numbers.
6. 20 ft Below sea level is -20 and 15 ft. Below sea level is -15, add -20+-15 (the new integer is -35)
I’m pretty sure it’s 86, because you need to subtract 2 from the first side then you have 86 = X
You have to know the coordinates of the center and the radius.
refer to this website for more information:
http://www.mathwarehouse.com/geometry/circle/equation-of-a-circle.php