The difference of two integers is always an integer.

$-14>-8-(-7)$

$-5-2>-8$

$(-7)-3=(-3)-(-7)$

The point $\mathrm{A}$ is on a mountain which is $5700$ metres above sea level and the point $\mathrm{B}$ is in a mine which is $39600$ metres below sea level. Find the vertical distance between $\mathrm{A}$ and $\mathrm{B}$.

Multiply $15$ by $9$.

Multiply $18$ by $-7$.

Multiply $29$ by $-11$.