Lizzie asks…Find the Dimensions of the garden such that the cost of the materials is minimized?A rectangluar garden of area 75 square feet is to be surronded on three sides by a brick wall costing $12 per foot and on one side by a fence costing $7 per foot.Mr. Thin Brick answers:Let B be the breadth & L the length in ft
obviously the brick wall should cover 2B + L to reduce cost
cost = 12(2B+L) + 7L = 24B + 19L
now BL = 75 so B = 75/L
and cost C = 24*75/L + 19L = 1800/L +
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