I have 3 questions.
The volume of a rectangular box is 16m^3. The box has a square base and top. The material for the base costs $7.25/m^2, for the top costs $2.25/m^2, and for the sides coss $4.25/m^2. For practical reasons, no dimension may be less than 1m. Determine the dimensions that will minimize the cost of the materials for the box. Show all your calculations and include a labelled diagram.
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A man is at point A on a bank of a straight river, 3km wide, and wants to reach point B, 8km downstream, on the opposite bank. He could row his boat directly across the river to point C and then run to B, or he could row directly to B, or he could row to some point D between C and B and then run to B. If he can row at 6km/h and run at 8km/h, how far from B should he land t reach B as soon as possible? Show all your calculations.
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A Norman window is made up of a semicircle and a rectangle. The total perimeter of the window is 32m. Determine max area of window. Show calculations.
2007-01-11
01:30:33
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2 answers
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asked by
Anonymous
in
Mathematics