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