2 + 1 = 3
3 - 3 = 0
Hope this helped :)
THE ANSWER IS THE COMMON DIFFERENCE IS -7.2 (first answer)
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90 degrees. Looking at a clock, 12 o'clock going all the way around and back is a 360 degree spin. So 12, 3, 6, and 9 are all 1/4 of a 360 degree spin. If you divide 360 by, you would get a 90 degree turn for each of those numbers mentioned above.