\( A \) varies directly with \( x^{2} \). If \( x=2 \) or 4 , then \( A= \) 20 . Find \( A \) if...

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\( A \) varies directly with \( x^{2} \). If \( x=2 \) or 4 , then \( A= \) 20 . Find \( A \) if \( x=8 \).
(a) 48
(b) 120
(c) 64
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