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Answer:
(8.4x10^8)-(1.2x10^8) = 7.2x10^8
Explanation:
=> (8.4x10^8)-(1.2x10^8)
=> 10^8 (8.4 - 1.2) ...(we take 10^8 common)
=>10^8 (7.2)
=>7.2x10^8