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(2 × 10^7) + (3 × 10^4)
= (2 × 10^7) + (0.003 × 10^7) . . . . make the exponents match
= (2 + 0.003) × 10^7
= 2.003 × 10^7
The appropriate choice is ...
... b. 2.003 × 10^7
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