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# An open rectangular box with square ends is to hold 6400 cm^3. It is built at a cost of \$ 75/ cm^2 for the base and \$25/ cm ^2 for the sides. Find...

13). An open rectangular box with square ends is to hold 6400 cm^3. It is built at a cost of \$ 75/ cm^2 for the base and \$25/ cm ^2 for the sides. Find the most economical dimensions.
14). A wall 8  meter high is 3 3/8 meter from a house. Find the shortest ladder which will reach from the ground to the house when leaning over the wall.
15 ). A company has the following schedule of  charges : \$30 per 1000 for orders of 50 000 or fewer , with the charge per thousand decreased by \$ 0.375 for each thousand above 50 000.  Find the order that will make the receipts a maximum.
16). Find the minimum distance from the point ( 3 , 4 ) to the parabola
Y^2 = 8x

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