What is a symblous?

How many strings of length less than 4 contains the language described by the regular expression (x y)y(a ab)? What would you do if there are two numbers in the middle when you are doing the mean in maths? How many centimetres are there in 5 feet 10 inches? What is the answer to 2.8 times 4 plus 9 plus 3 minus (2.8 plus 4.2)? What does regrouping mean? How many quarters are in one dollar and 5 nickels? What is 999 trillion plus 99.9 billion? What is the number of significant digits for 450000? What is a six sided 3d shape with triangular sides called? What is the opposite to division? In space there are two people of equal mass passing each other one of them is stationary and one is moving at a constant speed. There are no points of reference How do you work out who is moving? What volume does 30 in pennies fill? How do you find the largest multiple of 70 equal to or less than 375? 1400 square feet equals sq meters? What does wbtapi dll mean? Is 1720 divisible by 6? What is 24000 minus 8000? How do you add decibels? What is third form of practice? What is the relation between two numbers in math?