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  1. Recall that vertical lines around a number are the symbol for the absolute value of a number. Simplify each expression. Homework Help ✎

There cannot be a negative absolute value.

When a negative is outside of the absolute value symbol, it stays a negative.
When a negative is inside of the absolute value symbol, it becomes a positive, but do not confuse this with a minus sign.
Subtract the numbers first before finding the absolute value.