The measures of central tendency, fancy words for the middle, are
C. Mode
D. Mean
E. Median
It is centered at (h,k) --> (0,0) and has a radius 9
The equation of the circle is

Hope that helps!
5, 20, 80, 320, 1280, 5120, 20480, 81920, 327680, 1310720, 5242880, 20971520
The 12th term would be 20,971,520
Everything is being multiplied by 4 each time
Answer: 15.7659
Explanation: the column the 4 is in is the ten thousandths column. Since the number after it is 8, which is bigger than 5, you round up to make is 15.7659