The diagram shows two rectangles.

The green rectangle on the left has a width of $x \mathrm{cm}$. The length is six times the width.

The blue rectangle on the right has a width of $y \mathrm{cm}$. The length is $3 \mathrm{cm}$ more than two times the width.

Write an expression for the difference in the lengths of the rectangle.

Copy and complete the workings to find the value of each expression.

$x+9$ when $x=13$

      $x+9=13+9$

                $=$

Copy and complete the workings to find the value of $x$ in the given expression:

$\frac{x}{5}$ when $x=40$

$\frac{x}{5}=\frac{40}{5}$

Copy and complete the workings to find the value of the expression:

$10-x$ when $x=3$

$10-x=10-3$$=$_____

Copy and complete the workings to find the value of the expression:

$7x$ when $x=5$

$7x=7\times 5$

      $=$_____