A woman stands on a flat ground surface at the base of a 90 ft 90\text{ ft} tall observation tower. A hawk takes off from the top of the tower, descending at an angle of 45 ∘ 45^{\circ} 4 5 ∘ below the horizontal. Determine the rate at which the angle of elevation θ θ is changing with respect to the height of the hawk when it is located 65 ft 65\text{ ft} above the ground.

9 485 rad/ft \frac{9}{485}\text{ rad/ft}

18 485 rad/ft \frac{18}{485}\text{ rad/ft}

18 97 rad/ft \frac{18}{97}\text{ rad/ft}

9 97 rad/ft \frac{9}{97}\text{ rad/ft}

A woman stands on a flat ground surface at the base of a 90 ...

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