An eagle starts flying at an elevation of 42 ft. Elevation is the
distance above sea level. The diagram below shows the elevation changes during
the eagle's flight. Write an expression representing the eagle's flight. What is the
elevation at the brook?

Step-by-step explanation:

When an eagle gains the height, elevation of the eagle will be positive and when it goes down elevations will be negative.

Initial height of the eagle = 42 ft

Achieves the elevation = 144 ft

Goes down to 162 ft so the elevation will be = -162 ft

Gains the height again therefore, elevation of the eagle = 25 ft

Goes down to 65 feet so the elevation = -65 ft

Therefore, expression representing the eagle's flight will be,

(42 + 144 - 162 + 25 - 65)

Elevation at the brook = (42 + 144 - 162 + 25 - 65)

                                     = 20 ft

a - base

b - exponent

so,