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OpenStudy (anonymous):
the bottom of a valley is 10 m below sea level. a nearby city is 120 m above sea level. what is the difference in elevations between the valley floor and the city
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jimthompson5910 (jim_thompson5910):
"10 m below sea level." is the number -10 "120 m above sea level." is the number +120
jimthompson5910 (jim_thompson5910):
subtract the two +120 - (-10) = 120 + 10 = 130 so the distance between the two cities, the vertical distance, is 130 meters
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