Boolean operators are specific words used to combine keywords to improve the chances of finding relevant information. The most commonly used Boolean operators are AND, OR and NOT. Search results will contain both of the terms humour and therapy. Using AND decreases the number of results, because each time a keyword is added, the focus of the search is narrowed. Search results will contain one, or both, of the terms humour or laughter or comedy. Using OR increases the number of results, because a broader range of keywords is searched.
The actual cost of a flat roof depends on your location, the materials used, the complexity of the installation, and other factors. 1  Building a flat roof costs approximately $1.50 to $10.00 per square foot. 2  Assuming an average roof size of 1,500 square feet, that s a total cost of $2,250 to $15,000.
The national average for a 3,000 square foot asphalt shingle roof is roughly $11,500. The actual cost varies. Like anything, urban areas are generally more expensive than rural areas. The average cost of a roof in New York, for example is close to $15,000.The same roof replacement in Georgia or the deep south will probably cost less than $9,000. The Midwest is also less expensive. Homeowners in Wichita, Kansas pay an average of $10,000.ven within the same general region of the country, prices vary drastically. The average cost of a new roof in the Carolinas hovers around $7,000 while Atlanta homeowners pay around $10,000.