5) A square room is covered by a number of whole rectangular slabs of sides 0.6 m by 4.2 m Calculate the reast possible area of the roor in square metes.

1. Calcula la longitud del lado que falta: \( \begin{array}{lll}\text { a) } b=24: c=18 & \text { b) } a=10: b=8 & \text { c) } a=61: c=11\end{array} \quad \) d) \( b=15: c=11 \)

\( 1^{\circ} \) a) Write \( \widehat{x O z} \) using \( \widehat{x O y} \) and b) Write \( \widehat{y O I} \) using \( \widehat{y O z} \) and c) Show that \( \widehat{x O z}=\widehat{y O t} \).

22. A rectangular foor of a room measures 5.4 m long and 4.2 m wide. The room is to be covere with square tiles. Calculate the minimum number of square tiles that can be used to cover the floor.

- Given \( p=(3,-2), q=(-1,5) \), and \( r=(2,4) \) : i) Write \( p, q \) and \( r \) as column vectors ii) Hence determine \( 2 p-3 q+r \) - Given the points \( A(2,-3) \) and \( B(-4,7) \), determine: i) Vector \( \overrightarrow{A B} \) ii) The magnitude of \( |\overrightarrow{A B}| \).

12-inch pizza: \( r=12 / 2=6 \) So \( A=\pi(6)^{2}=113.1 \), square inches