Question 1030499
A hot-air balloon was decommissioned after a successful flight by letting the 3000 m^3 of air in it leak out. The loss in the volume of air in the balloon was exponential, decreasing at x percent per minute. If there was 1626 m^3 of air in the balloon 15 minutes after it began to be decommissioned, at what percent per minute to the nearest percent did the balloon lose air? Thanks for the help! 
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Form:: y = a*b^x
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f(0) = 3000 = a
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f(15) = 3000*b^15 = 1626
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Solve for "b"::
b^15 = 1626/3000 = 0.542
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b = 0.542^(1/15) = 0.9599
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Note:: "b" is the survival percentage
The loss percentage is 1-0.9599 = 0.04 or 4%
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Cheers,
Stan H.
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