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Anonymous
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5.378 E9 = 5.378 × 10⁹ = 5,378,000,000
If En = 2n then E9 = 2*9 = 18
4,375,000,000 could be written as 4.375 E9, where "E9" means "ten raised to the ninth power".
ya mum
If n = 9 then 2n must be 18.