# 93. Viewing angles for advertising: A 25-ft-widebillboard is erected perpendicular to a strai ghthighway, with the closer edge 50 ft away (seefigure). Assume the adverti sement on the billboardis most easily read when the viewing angle is 10.5°or more. (a) Use inverse functions to find anexpression for the viewing angle 0. (b) Use acalculator to help determine the distance d (totenths of a foot) for which the viewing angle isgreater than 10.5°. (c) What distance d maximizesthis viewing angle?nemleExercise 9350 ft25 ftair

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Step 1

To determine:

Part a) Expression for the viewing angle.

Part b) The distance d for which the viewing angle is greater than 10.50.

Part c) The distance d for which the maximize the viewing angle.

Step 2

Given:

Step 3

Formula Used:

...

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