Answer:
[tex]6.73 \times {10}^{ - 8} [/tex]
Step-by-step explanation:
7.4 × 10 ^-8 - 6.7 × 10^-9
= 7.4 × 10^-8 - 0.67 × 10^-8
= (7.4 - 0.67) × 10^-8
= 6.73 × 10^-8
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