(a) If varies inversely as \( x \), and if \( y=9 \) when \( x=2 \), find \( y \) when \( x=3 \). tif is inversely proportional to \( v \), and if \( u=12 \) when \( v=3 \), find \( u \) when \( v=9 \).

\begin{tabular}{l} WORKED EXAMPLE 6 \\ \hline\( P, Q, R \) are points in a plat \\ relative to the origin \( O \). Fo \\ \( \left|F_{1}\right|=3 \mathrm{~N},\left|F_{2}\right|=6 \mathrm{~N},\left|F_{3}\right|=3 \) \\ Show that the system, of th \end{tabular}

\( \left. \begin{array} { l } { ( + Y _ { 0 } ) + ( + r _ { 0 } ) } \\ { ( - Y ) - ( + 9 ) = } \\ { - r _ { 0 } \circ + ( - r _ { 0 } \circ } \\ { - r _ { 0 } - 10 = } \end{array} \right. \)

(5) Juca comprou 8 balas, 5 chicletes.

4.Площадь двух подобных треугольников равны 75 m \( ^{2} \) и 300 ² \( ^{2} \). Одна из сторон второго треугольника равна 9 м. Найдите сходственную ей сторону первого треугольника.

Question(4): Find the value of the following in the simplest form: \( 3 \sqrt{2}+2 \sqrt{18}-6 \sqrt{8} \)