Posted by **Anonymous** on Wednesday, April 14, 2010 at 7:15pm.

A bookcase is to be constructed as shown in the figure below. The height of the bookcase is 4 feet longer than the length of a shelf. If 20 feet of lumber is available for the entire unit (including the shelves, but NOT the back of the bookcase), find the length and height of the unit

- college algebra -
**PsyDAG**, Thursday, April 15, 2010 at 12:18pm
h = l + 4

Assume a box, but the two shelves will not necessarily be at the top and bottom of the box. Find the perimeter.

2h + 2l = 20

Substitute l + 4 for h in the second equation and solve for l. Put that value in the first equation to find h. Check by putting both values into the second equation.

- college algebra -
**melva**, Sunday, April 18, 2010 at 1:41pm
find the ratio of whole numbers that is equivaletion to the radio of 16 ft to 10 yd.

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