While scuba diving, Rajeev dove to a depth of 12.6 feet below the surface of the water and then descended another 8.7 feet. What expression can be used to find Rajeev’s new position?

Below the water’s surface is represented by a negative number, so Rajeev’s first position is −12.6 feet. Descending another 8.7 feet means moving farther down, so subtract 8.7: −12.6 − 8.7. The expression is −12.6 − 8.7.

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