From 187 feet below sea level, Paul took off in his helicopter and ascended 613 feet. What is Pauls

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From 187 feet below sea level, Paul took off in his helicopter and ascended 613 feet. What is Pauls elevation now?

Sea Level is 0 feet. 187 feet below sea level = -187 feet.

So we have 613 - 187 = 426 feet above sea level.