How do you write 6 billion and 1.2 Billion?
- How do you write $2,500 billion in numbers?
- How many zeros has a billion???!?
- The world population is estimated to be approximately 7 billion people. How many moles of people are there?
- The world’s population increased exponentially from 4.453 billion in 1980 to 5.937 billion in 1998 and continu?
- Why does a million seconds equal to 12 days but a billion seconds equals 31 years?