Answer: A row of 34 dimes would be about 612 millimeters long .
Explanation:
Given : A dime has a diameter of about 18 millimeters.
When we line up 34 dimes in a row , then the total length of the line will be :-
34 x Diameter of one dime.
i.e. The total length of the line =

Hence, a row of 34 dimes would be about 612 millimeters long .