Given that x

^{2}+ y^{2}+ z^{2}= 194, calculate z if x = 7 and (sqrt{y}) = 3-
**A.**

(sqrt{10}) -
**B.**

8 -
**C.**

12.2 -
**D.**

13.4

##### Correct Answer: Option B

##### Explanation

Given that x^{2} + y^{2} + z^{2} = 194, calculate z if x = 7 and (sqrt{y}) = 3

x = 7

∴ x^{2} = 49

(sqrt{y}) = 3

∴ y^{2} = 81 = x^{2} + y^{2} + z^{2} = 194

49 + 81 + z^{2} = 194

130 + z^{2} = 194

z^{2} = 194 – 130

= 64

z = (sqrt{64})

= 8