20.0 × 1015 written in regular notation is 20,000,000,000,000,000 (20 quadrillion).
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20 billion can be written as 2 x 10^10.
2 x 10^1 x 1 x 10^5 = 2 x 10^6
7.36 in the 5th power = 12.41 10 to the 5th power = 20 12.41 x 20 = 303.2
8 to the 15th power
x+10=20 then you subtract 10 from both sides x=10