Multiply both sides by the denominator (8)
-x =40
Check the picture below.
now, let's rationalize the denominator.
Based on the given situation above about Patrick's savings, I can say that the best option for him in order to keep up with the increase 20 years after would be to utilize a compound interest account. The answer would be option B. Notice that with compound interest account, the amount he gets is around $31,000. Hope this helps.