Unformatted text preview: available. 1. A max = 721 sq. ft. 2. A max = 729 sq. ft. correct 3. A max = 727 sq. ft. 4. A max = 723 sq. ft. 5. A max = 725 sq. ft. Explanation: Let x, y be the respective parts of the fence shown in the ±gure 20 ft x y Barn Then 2 x + 20 + 2 y = 88 , so adjacent sides of the fenced area will have length x + 20 , 34x. Hence, as a function of x , the area enclosed by the fence will be given by A ( x ) = (34x )( x + 20) . Di²erentiating A ( x ) with respect to x we see that A ( x ) =2 x + 14 ....
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 Spring '08
 CLARK,C.W./HOY,R.R
 amax, sq. ft

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