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

a number that will exceed the unknown number by five

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

the difference between $25$ and the unknown number.

Let the unknown number be $m$. 

If the cube of unknown number is $m^k$. Find $k$

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

a third of the unknown number plus three

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 $x$.