What does 999999999mean?

What does a144 mean when on a gold ring? Which is greater 0.2 L 240 ml 50 cl? What is the 3 digit number is divisible by 5 6 and 4? If every digit of a number is divisible by 3 then the number itself is divisible by 3? How many crores is 90 million? 22 multiplyed by 3? If A car travels down the highway at 55 mph its speed is what and its acceleration is what? Jim bought a drink for 82 cents. He gave the clerk $1.00. How much change will he get back? What is place value of 9 in 84.895? The sides of solid shapes are named what? What type of symmetry do all vertebrates have and what does it mean? What is the answer to 36 degrees minus 12 feet plus 15 degree minus 32 feet? What is the pattern of these numbers 200 185 170 155? What is the second digit in 994650? What is 0.7 divided in 10.71? How do you say 12345678987654321? How do you round off 3653 to the nearest hundred? How do you solve -7n-8 plus 6 equals 13-2? How many 9 letter combinations using 26 alphabet letters? What number multiplied by itself equals 36?