Why do you have to be 21?

Who was the lowest one on the social ladder? What are D1 and D2 in Black-Schole model? What does sound a girl calling with out saying her name? What size feet should you have if your 13? Why should you use negative factors of c when factoring a quadratic with c0 b0? 13m in a bd? How many mph is 100 meters in 9.98 seconds? What Roman Numerals advantage? What is a discount? What is the solution of the following system of eauations 3y equals 5x and y equals x plus 2? How much seconds do you have in the year? Can triangle have an obtuse and a right angle? Is a length of a river 30 miles 30 feet or 30 yards? 1 cubic meter covers an area of how many square meters to a depth of 150mm? What is defined as the inability to conceive a child after 12 months of trying? What is the domain and range of a quadratic function? What is 42 percent as a fraction? What is 23.7 divided by 3? How many quarters make 1 oz of silver? What is 20 divided by 8 percent?