Answer:
We have a1 = 27 and r = 3 (because 27:9 = 3; 9:3 = 3; 3:3 = 1);
Then s = 27 / (1 - 3) ;
Finally, s = - 27 / 2;
Step-by-step explanation:
I'm pretty sure the answer is checking account A. Hope this helps
Attached is a screenshot of spreadsheet used to do this problem.
You will see the excel functions used for each column. The average score is highlighted in blue.