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a) x = 2yz/5k 5kx = 2yz y = 5kx/2z z = 5kx/2y k = 2yz/5x b) a = 4zn²/3x 3xa = 4zn² z = 3xa/4n² n² = 3xa/4z n = √(3xa/4z) x = 4zn²/3a c) y = 2kn³/3x 3xy = 2kn³ k = 3xy/2n³ n³ = 3xy/2k n = ∛(3xy/2k) x = 2kn³/3y d) r = 5a²p/xy xyr = 5a²p a² = xyr/5p a = √(xyr/5p) p = xyr/5a² x = 5a²p/yr y = 5a²p/xr