Respuesta :

Answer:

77 millimeters

Step-by-step explanation:

10 millimeters = 1 centimeter

Therefore:

3 centimeters = 30 millimeters

47+30 = 77
The answer is 77
One centimeter is 10 millimeters.. from there turn the 3 into 30 then add to the 47
Have a good day❤️❤️

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