1,500,000,000
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It is: 500,000,000
5 x 10 to the 9th power is equal to 5 billion. When you multiply 5 by 10 raised to the 9th power, you are essentially multiplying 5 by 1 followed by 9 zeros. This results in a large number that is commonly expressed in scientific notation as 5 x 10^9.
2.8 x 109 = 2,800,000,000
15
It is x^4.5 or sqrt(x)*x^4