How many hours is 8am to 7pm?

What mathematic formula does the banker use on Deal or No Deal? What is the value of x if 3ax plus a equals 5a? Can five sixths be in the lowest term? What shapes are the faces of rectangular prism? Which one is bigger a .5 micron or a .9 micron? What is the equation of a line with a slope of 2 and a y-intercept of (417)? How many ostrich eggs are in 1 dozen? Are the mean and the range the same? What program gave people over 65 money? What is .01 times 3.9 trillion? What is the square root of 54 rounded to the nearest tenth? Does sly and cunning mean the same thing? What does the abbreviation adj refer to? Is one trillion bigger than 100 billion? What two numbers go into both the numbers 98 and 100 equally? Did The Byzantine Empire fell in 1543? Is 7 over 15 equivalent to 1 over 7? What type of percent is each item expressed as in a horizontal analysis in accounting? Who is Pierre de Fermat's parents and siblings? What is an antonym for nothing?