The top of a mountain is 1270 feet above sea level. The bottom of a valley is 650 feet below sea level. How high is the mountain top from the bottom of the valley?

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Solution

The top of mountain is above the sea level and the bottom of valley is below the sea level.
So, we will denote height above sea level as positive and depth below sea level as negative.

Hence, height of top of mountain = +1270 feet
And depth of bottom of valley = - 650 feet

Thus, distance between the top of mountain and bottom of valley is:
1270 - (- 650) = 1270 + 650 = 1920 feet

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The top of a mountain is 1270 feet above sea level. The bottom of a valley is 650 feet below sea level. How high is the mountain top from the bottom of the valley?​

The top of a mountain is 1270 feet above sea level. The bottom of a valley is 650 feet below sea level. How high is the mountain top from the bottom of the valley?