Verlfy $-(-x)=x$ for

$x=\frac{3}{5}$

Verlfy $-(-x)=x$ for

$x=\frac{-7}{9}$

Verlfy $-(-x)=x$ for

$x=\frac{13}{-15}$

Verlfy the property $x+y=y+x$ of rational numbers by taking

$x=\frac{1}{2}, y=\frac{1}{2}$

Verlfy the property $x+y=y+x$ of rational numbers by taking

$x=\frac{-2}{3}, y=\frac{-5}{6}$

Verlfy the property $x+y=y+x$ of rational numbers by taking

$x=\frac{-3}{7}, y=\frac{20}{21}$

Verlfy the property $x+y=y+x$ of rational numbers by taking

$x=\frac{-2}{5}, y=\frac{-9}{10}$

Simplify each of the following by using suitable property. Also name the property.

$\left[\frac{1}{2}\times \frac{1}{4}\right]+\left[\frac{1}{2}\times 6\right]$