The quantity \(y\) is directly proportional to \(4x^2\). If \(x\) is reduced by \(40\%\), find the percentage decrease in \(y\).
The quantity \(y\) is inversely proportional to \(x^2\). If \(y=18\) for one value of \(x\), find \(y\) when that \(x\)-value is increased by \(200\%\).
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