What is x-pass?

What is the trick to multiplying 9's? What is 1percent of 1000? What is adding the same number a given number of times? What number is bigger -2 or 7? What are the grade three trumpet scales? Can you replace 2.5a with 10a? Which mathematicians helped to discover alternatives to eucildean geometry in the 19th century? What is 10 and a half as a decimal? If two lines are perpendicular then? How do you convert 0.250 kg to mg? What is 84 over 154 in its simplest form? What is 656 feet in inches? How did Einstein's contribution to math change the world? Why the properties using zero exponents and negative exponents specify that the bases be nonzero numbers? Factor tree of 441? Did Mary Somerville discover or invent anything do to mathematics or science? Lines of symetry in a rectangle? What is 10 over 40 simplified? What is the sq footage of a 12 by 12 room? Project on statistics for class 10?