How many zero are in billon?

What numbers goes into 180? What is a palindrome for a principle? How many 12 are in 4 wholes? What is the largest prime number less than 500 that is the product of 2 prime numbers? What is 15 over 2 in its simplest form? What is 32-y equals 18? What is the remainder when 8654 is divided by 44? When four times a number is added to 9 times the number the result is 39. What is the number? What is the root definition for invariably? If charge is 250.00 an hour and you work 2 hours and 40 minutes how much is it? What is the function of mark 1? Why did the Egyptians build the pyramids using a slant height angle of about 44 degrees or 52 degrees? What is 3.254 as a fraction? Are there any differences between modern and ancient notation of Roman numerals and if so could you kindly explain what they are please? How many months from first April to first December? How do you transfer 355 milliliters to cubic units? How do you find a remainder? What is 280 in Roman numerals? What is 45.56 rounded to the nearest whole? How long is 144 miles?