Question 19, section 7, test 7.
If k, n, x, and y are positive numbers satisfying x^-4/3 = k^-2 and y^4/3 = n^2, what is (xy)^-2/3 in terms of n and k?
From above, y^2/3 becomes n^1
y^-2/3 = n^-1
x^-2/3 = k^-1
(xy)^-2/3 = x^-2/3 * y^-2/3 = k^-1 * n^-1 = 1/nk so (A)
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