The common difference is B. 5 because the numbers are increasing by 5.
The answer is 1 and 7/8, all you have to do is turn the 3/4 into eighths.
To rotate a figure
90 degrees(-y,x)
180 degrees(-x,-y)
270 degrees(y,-x)
If your original point is (1,2) or example and you want to rotate it say 270 degrees the final point would be (2,-1)
Hope this helped!!!!!