What does 3x 12-xy-4y equal?

What is 2 billion in roman numeral? What is the formula used to find the speed? What is an example of a pneumatic fluid? Who started cross country running? What comes after 03099? What is a fraction of a minute called? If a 25 foot ladder is leaning against a housemand it has a base of 9 feet from the house. The ladder is moved 6 more feet from the house how far will the ladder slide down the house? 14 feet x 14 feet into square feet? What is the repeating decimal 0.7 in a percentage? How to Write 444 different ways? Why are crevasses only 40m deep? How do you write 3 and a half million in figures? What kind of complement is the word in bold? How many thousands make from 2700? Is 991 a whole number? How should three vectors of equal magnitudes be arranged so that they are in equilibrium? What are the primary uses of a bar code? How much do you complement a waiter? Is 80mm equal to a 3inch ball? How many 4 digit combinations can you make using 1 2 3 4 5 6 with out repeating any numbers?