# An airplane descends 1.9 miles to an elevation of 7.05 miles. Find the elevation of the plane before its descent. What is the initial elevation of the plane?

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#### Explanation

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#### Explanation:

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Feb 8, 2018

See a solution process below:

#### Explanation:

The formula for calculating change in elevation is:

$s + c = e$

Where,

$s$ is the starting elevation: what we are solving for in this problem.

$c$ is the change in elevation: -1.9 miles for this problem. It is a negative number because we are told the airplane descends.

$e$ is the ending elevation: 7.05 miles for this problem.

Substituting and solving for $s$ gives:

s + (-1.9" miles") = 7.05" miles"

$s - 1.9 \text{ miles" = 7.05" miles}$

s - 1.9" miles" + color(red)(1.9" miles") = 7.05" miles" + color(red)(1.9" miles")

$s - 0 = \left(7.05 + \textcolor{red}{1.9}\right) \text{ miles}$

$s = 8.95 \text{ miles}$

The airplanes initial elevation was 8.95 miles.

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