Express $\frac{21}{57}$ with numerator equal to $7$.

Represent the following rational number on the number line.

$\frac{1}{2}$

Represent the following rational numbers on the number line.

$\frac{-1}{2}$

Represent the following rational numbers on a number line:

$\frac{1}{3}$

Represent the following rational number on a number line.

$\frac{-1}{3}$

Represent the following rational numbers on a number line:

$\frac{1}{4}$

Represent the following rational number on the number line:

$\frac{-1}{4}$

Represent the following rational number on the number line:

$\frac{-10}{7}$