Suppose your business has a special checking account used for paying the cable bill. The balance is 800.00 this month. Next month will be 717.50, after that it will be 635.00, and on the third it will be 552.50. Which best illustrates this situation

800(82.5)^x
-82.5(800)^x
-82.5x + 800
x^2 - 82.5x + 800