# B how much wire should be used for the square in

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(b) How much wire should be used for the square in order to minimize the total area?\$\$293·(49+43)m
Solution or ExplanationClick to View Solution10.13/13 points |Previous AnswersSCalcET7 4.7.046.MI.SA.This question has several parts that must be completed sequentially. If you skip a part of the question,you will not receive any points for the skipped part, and you will not be able to come back to the skippedpart.Tutorial ExerciseA boat leaves a dock at8:00PM and travels due south at a speed of 20 km/h. Another boat has beenheading due east at 15 km/h and reaches the same dock at9:00PM How many minutes after8:00were the two boats closest together?Part 1 of 7Lettbe the time, in hours, after8:00PM If the position of the boat att= 0 corresponds to the origin,then the position of the boat heading south at timetisPM
12/14/16, 3)50 PMhw24S4.7Page 6 of 9Part 2 of 7The position of the boat heading east at timetisPart 3 of 7The distanceDbetween the two boats is given byPart 4 of 7We will minimizePart 5 of 7We havePart 6 of 7Solvinggives uswhich is a minimum sincePart 7 of 7Round your answer to the nearest minute.(x,y) =\$\$0,\$\$20t.(x,y) = (-15-15+ 15t,00).D=.225225(t1)2+400400t2f(t) = [D(t)]2= 225(t1)2+ 400t2=625625t2450450t+225225.f'(t) =12501250t450450.0 =f'(t)t=,4504501250f''(t) > 0.
12/14/16, 3)50 PMhw24S4.7Page 7 of 9The boats are closest together2222minutes after8:00PM.You have now completed the Master It.11.3/3 points |Previous AnswersSCalcET7 4.7.047.A man launches his boat from pointAon a bank of a straight river,3km wide, and wants to reach pointB,1km downstream on the opposite bank, as quickly as possible (see the figure below). He could rowhis boat directly across the river to pointCand then run toB, or he could row directly toB, or he couldrow to some pointDbetweenCandBand then run toB. If he can row 6 km/h and run 8 km/h, whereshould he land to reachBas soon as possible? (We assume that the speed of the water is negligible

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