The answer would be D. 96 combinations because 4 times 3 is 12 now you multiply that by 8 and its 96
No. The circle can be composed of completely negative coordinates, but the radius is always a positive value. You can prove this by plugging any point and the center into the distance formula.
12x12.5=150
Steps:
1. convert 12.5 into a fraction: 25/2
2. also convert 12 into a fraction: 12/1
3. multiply 25/2x12/1=150.
Hope I helped! :D