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The result after adding $3.8 \times 10^{- 6} t o 4.2 \times 10^{- 5}$ with due regard to significant figures is

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4.58×10−5

0.458×10−4

4.6×10−5

45.8×10−6

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detailed solution

Correct option is C

3.8×10−6+4.2×10−5=(3.8×10−1+4.2)×10−5=(0.38+4.2)×10−5=(4.58)×10−5Rounding off to one place of decimal.The sum =4.6×10−5

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The result after adding 3.8×10−6 to 4.2×10−5 with due regard to significant figures is

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The result after adding $3.8 \times 10^{- 6} t o 4.2 \times 10^{- 5}$ with due regard to significant figures is