7 billion in numbers looks like 7,000,000,000. There are nine zeros in one billion, so you can simply add nine zeros to 7 to get 7,000,000,000.
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4,700,000,000
Use the definition of "cubed". 7 billion cubed is the same as 7 billion x 7 billion x 7 billion.
34% of 7 billion = 7*34/100 billion = 2.38 billion.
15/100000000 or 0.00000015 or 1.5 * 10^-7
7 billion