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Add 1.2 × 10 ...

Question

Add 1.2×10 rays to 5 and 2.8×10 rays to 7.

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Solution

1.2 x 10^5 + 2.8 x 10^7
= 0.012 x 10^7 + 2.8 x 10^7
= 2.812 x 10^7

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