93. Viewing angles for advertising: A 25-ft-wide billboard is erected perpendicular to a strai ght highway, with the closer edge 50 ft away (see figure). Assume the adverti sement on the billboard is most easily read when the viewing angle is 10.5° or more. (a) Use inverse functions to find an expression for the viewing angle 0. (b) Use a calculator to help determine the distance d (to tenths of a foot) for which the viewing angle is greater than 10.5°. (c) What distance d maximizes this viewing angle? ne m le Exercise 93 50 ft 25 ft air

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