ANSWER
[tex]\begin{gathered} 0.030in=0.762mm \\ 0.035in=0.889mm \end{gathered}[/tex]
EXPLANATION
We want to convert the electrode sizes to millimeters.
We are given that 1 in is equal to 25.4 mm. This implies that to convert from inches to millimeters, multiply the given measurements in inches by 25.4.
For 0.030 in:
[tex]\begin{gathered} 0.030\text{ }in=0.030*25.4\text{ }mm \\ \Rightarrow0.762\text{ }mm \end{gathered}[/tex]
For 0.035 in:
[tex]\begin{gathered} 0.035\text{ }in=0.035*25.4\text{ }mm \\ \Rightarrow0.889\text{ }mm \end{gathered}[/tex]
That is the answer.
