Let the unknown number be $m$. Write expression for :

four times the unknown number less twice the number.

Let the unknown number be $x$. Write expressions for:

three more than $x$.

Let the unknown number be $x$. Write expressions for:

six less than $x$.

Let the unknown number be $x$. Write expressions for:

ten times $x$.

Let the unknown number be $x$. Write expressions for:

the sum of $-8$ and $x$.

Let the unknown number be $x$. Write expressions for:

If the sum of the unknown number and its square is $x+x^k$ find $k$.

Let the unknown number be $x$. Write expressions for:

a number which is twice $x$ more than $x$.

Let the unknown number be $x$. Write expressions for:

the fraction obtained when double the unknown number is divided by the sum of the unknown number and four.

Evaluate the following expression for $x=3$.

$3x$