Select the right answer.

This expression may contain adjacent signs, two signs next to each other. 5+(-5) or 5-(-5). To simplify these expressions, convert the two signs into one. The method is simple: If the two signs are different replace them both with a negative sign. 5+(-5) becomes 5-5, 5-5=0. If they are both the same, whether positive or negative, replace them with a single positive sign. 5-(-5) becomes 5+5, 5+5=10.

The expression may also contain signed numbers like -6-7 once you have simplified adjacent signs. To simplify signed numbers like these think of these numbers as either adding to or in this case subtracting from. Since both numbers are subtracting from you would combine the two totals. -6 and -7 when combined equal -11.

Straight lines surrounding an expression is asking for the absolute value. |-9|=9. The expression 5-|-9| becomes 5-9 and 5-9=-4