The sum is 160/(1-r)=1280 where r is the common ratio,
1/(1-r)=1280/160=8
Inverting we get 1-r=1/8, r=7/8.
Answer:
I simply separated the number into two numbers that I know are directly related to 9. 90 and 45 gives me around 135 ignoring the 22 cents since this is an estimation. 9*10 is equal to 90 and 9 times 5 is equal to 45. So I can estimate that the answer is around 15.
Step-by-step explanation:
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