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The depth of a lake at a certain point, wich is a function of the distance of that point from shore, is 30 feet.

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? 12.6 – 8.7 –12.6 – 8.7 –12.6 – (–8.7) 12.6 – (–8.7)

Ineed if you could explain and give me the answer you! this needs done