Solve for \( x \) and \( y \) simultaneously: \( 3^{x+y}=27 \quad \) and \( \quad x^{2}+y^{2}=17 \)

\( 70 : 40 = 700 : \frac { } { T } \)

\[ \frac{(2 n-3)!\cdot(3 n-3)!}{(2 n-1)!\cdot(3 n-4)!}=\frac{1}{14} \] olduğuna göre, \( n \) kaçtır?

A straight highway connects Town A and Town B, a distance of 45 kilometres, Andy started biking along the highway from Town A to Town B at 8:00 AM at a constant speed of 3 kilometres per hour. Ben started biking on a parallel highway from Town B to Town A at 9:00 AM at a constant speed of 4 kilometres per hour. How many kilometres had Ben biked when they met along the way?

5. \( \frac{(n+1)!}{(n-4)!}=6 n^{2}+6 n \) olduğuna göre, \( n \) kaçtır? \( \begin{array}{llll}\text { A) } 7 & \text { B) } 6 & \text { C) } 5 & \text { D) } 4 \\ \text { 5) } 3\end{array} \)

\( 88 : 66 = 8 : \frac { } { R } \)