\[\boxed{\ \mathbf{494.}}\]
\(1)\ x^{2} - 14;\ \ если\text{\ \ }x = 5;\ 18:\)
\[5^{2} - 14 = 25 - 14 = 11;\]
\[18^{2} - 14 = 324 - 14 = 310.\]
\[2)\ 2y^{2} + 13;\ \ если\text{\ \ }y = 6;100:\ \]
\[2 \cdot 6^{2} + 13 = 2 \cdot 36 + 13 =\]
\[= 72 + 13 = 85;\]
\[2 \cdot 100^{2} + 13 =\]
\[= 2 \cdot 10\ 000 + 13 =\]
\[= 20\ 000 + 13 = 20\ 013.\]