$$\(20 y \propto \frac{1}{\sqrt{x}}\)$$ （b）When $$\(x\)$$ is increased by a factor of 4 ，the value of $$\(y\)$$ changes by a factor of $$\(p\)$$ ． Find the value of $$\(p\)$$ ． $$\(p=\)$$ ............................................ DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN

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