Is subtraction associative in rational numbers? Explain with an example.

Verify that $– (–x) = x$ for $x=\frac{2}{15}$.

Verify that $– (–x) = x$ for $x=\frac{-13}{17}$.

Write the rational number that does not have any reciprocal.

Write the reciprocal of negative rational number.

Write the rational number for the points labelled with letters, on the number line.

Write the rational number for the points labelled with letters, on the number line.

Represent $-\frac{13}{5}$ on the number line.

Represent $\frac{9}{7}$ on the number line.