Given that 520.21 = x, 520.18 = y and xz = y10, then the value of z is close to:
8.57
xz = (520.21)z = 520.21z and y10 = (520.18)10 = 521.8.
Equal bases, so 0.21z = 1.8.
z = 1.8 ÷ 0.21 = 180/21 ≈ 8.57.
Hence, the answer is 8.57.
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