Match the signal word in the left column with the correct information in the right column. \( \begin{array}{ll}1 & \text { 1. of } \\ 3 & \text { 2. } \%\end{array} \)

An unknown compound has the following chemical formula: \[ \mathrm{C}_{2} \mathrm{~F}_{\mathrm{x}} \] where \( x \) stands for a whole number. Measurements also show that a certain sample of the unknown compound contains 8.7 mol of fluorine and 2.89 mol of carbon. Write the complete chemical formula for the unknown compound.

\( \left\{\begin{array}{l}y=2x \\f(x)=-2x\end{array}\right. \)

Garis lurus \( 3 y+4 x=5-h \) menyilang paksi-y pada -4 k dengan keadaan h dan k adalah pem Ungkapkan h dalam sebutan k . Garis lurus \( 3 y+2 x-6=0 \) adalah berserenjang dengan garis lurus \( p y+q x=7 \). Cari (i) Nilai p dan q . (ii) Koordinat titik persilangan di antara kedua-dua garis.

Pavcets Factorise \( 7 a+21 b+35 \) \( =\square b a+\square b+\square \) Please fill in all the gaps.

\( \dot { i } ^ { 2 } \cdot \sqrt { a b } = \)