Question

PICTURE ATTACHED please help

Answer 1

`6.73 * {10}^( - 8)`

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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