8, because if you add 7, 8, 8, 8, 8, 7, and 9 together, you get 64. Then because there are 8 numbers, you divide 8 from 64, and Boom!
Hope this helps!
D because the sequence would be by two and then the others are skipping different numbers than D
The answer is the second one
You find circumference w the diameter given
equation
circumference- 2(pie)R (use the pie symbol)
C the bank will exchange his new car for a old one