Please help ( question 9)
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The physical fitness of an athlete is often measured by how much oxygen the athlete takes in (which is recorded in milliliters per kilogram, ml/kg). the mean maximum oxygen uptake for elite athletes has been found to be 60 with a standard deviation of 7.2. assume that the distribution is approximately normal.

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Which of the following is the explicit rule for a geometric sequence defined a recursive formula of a -5a for which the first term is 23?