2. Find two positive numbers whose product is 750 and for which the sum of one and 10 times the other is a minimum.

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2. Find two positive numbers whose product is 750 and for which the sum of one and 10 times the other
is a minimum.
3. Let x and y be two positive numbers such that x+2y = 50 and (x+1)(y+2) is a maximum.
4. We are going to fence in a rectangular field. If we look at the field from above the cost of the vertical
sides are $10/ft, the cost of the bottom is $2/ft and the cost of the top is $7/ft. If we have $700
determine the dimensions of the field that will maximize the enclosed area.
5. We have 45 m? of material to build a box with a square base and no top. Determine the dimensions
of the box that will maximize the enclosed volume.
6. We want to build a box whose base length is 6 times the base width and the box will enclose 20 in³.
The cost of the material of the sides is $3/in? and the cost of the top and bottom is $15/in?. Determine
the dimensions of the box that will minimize the cost.
7. We want to construct a cylindrical can with a bottom but no top that will have a volume of 30 cm³.
Determine the dimensions of the can that will minimize the amount of material needed to construct the
can.
8. We have a piece of cardboard that is 50 cm by 20 cm and we are going to cut out the corners and fold
up the sides to form a box. Determine the height of the box that will give a maximum volume.
50 cm
20 cm >
Transcribed Image Text:2. Find two positive numbers whose product is 750 and for which the sum of one and 10 times the other is a minimum. 3. Let x and y be two positive numbers such that x+2y = 50 and (x+1)(y+2) is a maximum. 4. We are going to fence in a rectangular field. If we look at the field from above the cost of the vertical sides are $10/ft, the cost of the bottom is $2/ft and the cost of the top is $7/ft. If we have $700 determine the dimensions of the field that will maximize the enclosed area. 5. We have 45 m? of material to build a box with a square base and no top. Determine the dimensions of the box that will maximize the enclosed volume. 6. We want to build a box whose base length is 6 times the base width and the box will enclose 20 in³. The cost of the material of the sides is $3/in? and the cost of the top and bottom is $15/in?. Determine the dimensions of the box that will minimize the cost. 7. We want to construct a cylindrical can with a bottom but no top that will have a volume of 30 cm³. Determine the dimensions of the can that will minimize the amount of material needed to construct the can. 8. We have a piece of cardboard that is 50 cm by 20 cm and we are going to cut out the corners and fold up the sides to form a box. Determine the height of the box that will give a maximum volume. 50 cm 20 cm >
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