Answer:
5.68 x 10^5
Explanation:
5.3 x 10^5 + 3.8 x 10^4 = 5.68 x 10^5
5.3×10^5=53×10^4
53×10^4+3.8×10^4
=56.8×10^4
=5.68×10^5. Hope it help!
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