Evaluate each expression. See Example 5. –(–5) + (–15) – 6 – (–48) Reference Example 5...

Evaluate each expression. See Example 5.

–(–5) + (–15) – 6 – (–48)

Reference Example 5

Evaluate: –(–6) + (–18) – 4 – (–51)

Strategy This expression involves one addition and two subtractions. We will write each subtraction as addition of the opposite and then evaluate the expression.

Why It is easy to make an error when subtracting signed numbers. We will probably be more accurate if we write each subtraction as addition of the opposite.

Solution We apply the rule for subtraction twice. Then we will add the positives and the negatives separately, and add those results. (By the commutative and associative properties of addition, we can add the integers in any order.)