How did you kown?

If a runner increases velocity from 2 ms to 4 ms over a period of W seconds what is her acceleration? What does 600MA stand for? Who divided a circle into 360 degrees? What is meaning to bring to a conclusion? When is the sum of a positive integer and a negative integer positvie? Is All points of a sphere are equal distances to its center? What weighs 1000 tons? 310850 round to the nearest thousand? What is the decimal for 60 percent? How do you you write infinity? What is the angle of 135 called? When you multiply any number by 1 the product is that number? What is 09 23 1988 in roman numerals? What is 792 divided by 8? When was the New Testament started? What are solutions for the number 16? How does a carpenter use geometry? How old would you be in 2013 if you were born in 1990? What comes first in abc order eight or eighteen? What are the angle measurements for an Obtuse triangle?