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?

+3.

To find this answer, add the two numbers given together with whether or not they'd be a negative or positive value: -6 + 9

This is because you want to use what you started with, the decrease of 6 cents, and add on the increase of 9 to find out what the new increase/decrease is.

Hope this helps!

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step-by-step explanati∵∵∴∴on: