Answer:
9.0 x 10^4
Explanation:
(6.0 x 10 ^4) + (3.0 x 10 ^4)
=> 6 x 10000 + 3 x 10000
=> 10000(6+3)
=> 9(10000)
=> 9 x 10^4
=> 9.0 x 10^4
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