Tomas works as an underwater photographer. 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 a coral reef. Write and evaluate an expression to find his position
relative to sea level when he took the photo.

15 represents where he started, then he rises upward 9 and then gets to 6. Afterwards he goes down 12 and ends up at 18 which is 3 feet lower then where he originally started.

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Tomas works as an underwater photographer. 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 a coral reef. Write and evaluate an expression to find his position relative to sea level when he took the photo.

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Tomas works as an underwater photographer. 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 a coral reef. Write and evaluate an expression to find his position
relative to sea level when he took the photo.