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Mathematics for IGCSE & O level - Proportion (Section 1 - No. 11)

If *y* is inversely proportional to *x*3, and *y* = 2 when *x* = 2, then what is the constant of proportionality?
4
8
16
32

Wyjaśnienie

Since y = k/x^3, then 2= k/2^3, so k=16

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