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Chapter 1: Problem 74

Solve by writing a sum of signed numbers and adding. Lake Assal in Africa is 512 feet below sea level. What is the elevation of a person standing 642 feet above Lake Assal?

Short Answer

Expert verified
The elevation of the person is 130 feet above sea level.

Step by step solution

01

Understanding the problem

Firstly, need to understand that the sea level is considered the 0 point. Anything above sea level is positive and anything below sea level is negative. Now, Lake Assal is 512 feet below sea level, so it is -512 feet. The person is standing 642 feet above Lake Assal.
02

Signed Numbers

Since the person is standing above the lake, his position compared to Sea level can be found by a sum of signed numbers. His standing position will be the sum of signed numbers which is (-512) + (+642).
03

Addition

Now just add these values. Note that when adding a negative number, it's like subtracting. -512 + 642 equals 642 - 512. Therefore, the elevation of the person will be 642 - 512 = 130 feet above sea level.

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