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He starts at a position that is 15 feet below sea level . He rises 9 feet , then descends 12 feet to take a photo of coral reef . Write and evaluate an expression to find his position relative to sea level
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He starts at a position that is 15 feet below sea level . He rises 9 feet , then descends 12 feet to take a photo of coral reef . Write and evaluate an expression to find his position relative to sea level when he took the photo .

User Henrik Heimbuerger
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-15+9=(-6) -6+(-12)=(-18) His position is 18 feet below sea level.

User SRaj
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