The number of subscribers to an online service decreases by \(12\%\) every \(3\) months.
There are currently \(17\,037\) subscribers. Estimate the number of subscribers \(9\) months ago, giving your answer to the nearest whole number.
[2]A rectangular swimming pool has a length that is \(2.5\) times its breadth.
The length is shortened by \(10\%\), while the breadth is increased by \(40\%\).
Without assuming whether the perimeter increases or decreases, calculate the percentage change in its perimeter.
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