Correct Answer: Option B

Explanation

Given that x² + y² + z² = 194, calculate z if x = 7 and \(\sqrt{y}\) = 3

x = 7

∴ x² = 49

\(\sqrt{y}\) = 3

∴ y² = 81 = x² + y² + z² = 194

49 + 81 + z² = 194

130 + z² = 194

z² = 194 - 130

= 64

z = \(\sqrt{64}\)

= 8

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