Answer:
6.43 × 10^-4 or 0.000643
Explanation:
0.00067 - 2.3 × 10^-5 = 6.7 × 10^-4 - 2.5 × 10^5
6.7 × 10^-4 = 67 × 10^-5
67 × 10^-5 - 2.3 × 10^-5 = 64.3 × 10^-5 = 6.43 × 10^-4
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