Answer
20 ft
Work Step by Step
Each time the eagle moves up, his elevation increases. When the eagle moves down, his elevation decreases.
Create an equation that adds each increase in elevation and subtracts each decrease in elevation. Simplify to find the final elevation.
$42+144-126+25-65\longrightarrow$ add and subtract working left to right
=$186-126+25-65$
=$60+25-65$
=$85-65$
=$20$
