Question

4. On Monday, the price of gas decreased 6 cents; on Tuesday, it increased 9 cents. What was the overall decrease or increase of the price of gas by the end of the day on Tuesday?

Answer 1

increase of 3

Explanation:

The problem can be modeled by the equation:

-6 + 9

The -6 represents the decrease of 6 on Monday, and the +9 represents the increase of 9 on Tuesday. The six negatives cancel out six of the positives leaving us with three positives (+3) which means the price of gas increased by 3 by the end of the day on Tuesday.