determining how many years it takes for money to double at a particular interest rate
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Albert Einstein
rule: add 18 to each number, starting with 18.
a rule that is used to help balance equations (used in chemistry)
It appears that a number of -79 is missing in the sequence and so if you meant -58 -65 -72 -79 -86 then the nth term is -7n-51 which makes 6th term in the sequence -93
8 years.