According to the projections of the U.S. Census Bureau (http://www.census.gov/ipc/www/idb/worldpop.html), the world's population will surpass 7 billion in 2012.
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Square root(7 billion) = 83,666.0027
It is: 3.5 billion
Well, when we say "c is less than 7," it means that the value of c is smaller than 7. Imagine c as a little bird flying below the number 7 in the sky. It just reminds us that c is a number that comes before 7, like a friendly little reminder to stay close to the number 7 but not quite reach it yet.
When we multiply by 109 this means we are multiplying by 10 nine times. This has the effect of moving the decimal point 9 places to the right.So, if we move the decimal 2 places we get 156 and then if we move it 7 places more this is the same as adding 7 zeroes to the end of the number.Thus the answer is 1,560,000,000 (1 billion & 560 million)
Oh, isn't math just delightful? Let's think about some equations that equal 7. How about 3 + 4 = 7 or 10 - 3 = 7? Remember, there are many ways to reach the answer, and each path is filled with happy little numbers just waiting to be discovered.