Rewrite the following statement using mathematical symbol.

$19$ is less than $45$.

Rewrite the following statement using mathematical symbol.

$12$ plus $18$ is equal to $30$.

Rewrite the following statement using mathematical symbol.

$0.5$ is equal to $\frac{1}{2}$.

Rewrite the following statement using mathematical symbol.

$0.8$ is not equal to $8.0$.

Rewrite the following statement using mathematical symbol.

$-34$ is less than $2$ times $-16$.

Rewrite the following statement using mathematical symbol.

Therefore the number $x$ equals the square root of $72$.

Rewrite the following statement using mathematical symbol.

A number $\left(x\right)$ is less than or equal to negative $45$.

Rewrite the following statement using mathematical symbol.

$\mathrm{\pi }$ is approximately equal to $3.14$.

Rewrite the following statement using mathematical symbol.

$5.1$ is greater than $5.01$.