The term square in reference to roofing materials refers to 100 square feet of roof area. One square of slate is the amount of slate that it takes to cover 100 square feet of roof area. A 10 foot x 10 foot section of roof would equal one square. So would a 4 foot x 25 foot section. Ditto for a 5 foot x 20 foot.
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1 With plenty of expansion options, a Mac Pro equipped with 8-core processor, 6GB memory and Mac's fastest graphics will cost about $3,300 without a monitor. With a 24-inch flat-panel Apple monitor expect to pay about $4,200.  Apple's general-purpose laptop, the MacBook, ranges in price from about $1,000 to $2,800.