Subtracting Integers - sea level difference

From the book: "If the elevation of Lake Superior is 600 feet above sea level and the elevation of the Caspian Sea is 92 feet below sea level, find the difference of the elevations."

**My answer: 600 - (-92) = 600 + 92 = 692 ft**

Am I correct? This seems very obvious to me, but I'm just double checking.

I realize that this is really late.

I would like to point out why in algebra you say $\displaystyle 600-(-92)$

it is because in moderately low to highly advanced math you are **NOT** allowed to use logic, only formulas. Therefore, I would say the formula for solving this problem is $\displaystyle a-b=c$ and then I would substitute the values into this equation $\displaystyle (600)-(-92)=692$

Another reason: when you start to get into bigger equations, you will have to use the cumulative property of addition and other properties...

an example:

$\displaystyle 2x^2-3x-x^2+5x\quad\Rightarrow\quad2x^2+(-3x)+$$\displaystyle (-x^2)+5x\quad\Rightarrow\quad2x^2+$$\displaystyle (-x^2)+5x+(-3x)\quad\Rightarrow\quad x^2+2x$