document.write( "Question 360160: As you know my brother Jim is an avid fisherman. He varies the depth at which he fishes according to the following function: D(t)=-t^2+10t where t is measured in hours. Estimate the time when he fishes at the greatest depth and tell me that depth. \n" ); document.write( "

Algebra.Com's Answer #256981 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi,
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document.write( " D(t)=-t^2+10t = -1t(t+10)
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document.write( "t(-t+10) = 0
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document.write( "t = 0
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document.write( "(-t+10)=0
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document.write( "t = 10
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document.write( "vextex is when t = 5 (midpoint of (0,0) and (10,0)
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document.write( "D(5)=-25 + 50 = 25
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document.write( "at 5hrs, the fisherman fishes at the greatest depth
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