Answer:
3.4 centimeters and 34 millimeter
Explanation:
a good way to remember how to convert something from centimeters to millimeters is khdbdcm (kilo, hecto, deca, base units like liter, deci, centi, mili) and what you do is if it's 34 centimeters and you're trying to change to millimeters than you slide the decimal over to the right and add a zero