A cube has an edge lenght of 9 centimeters

Answer: 72Cm

Step-by-step explanation:

The perimeter is 4 times 1 side

currently, it is 9 times 4 or 36

increased by 3

I think y mean times 3

so 9*3=27

new perimeter is 27*4=108

how much larger is it?

108-36=72

it is 72cm larger

it is the first answer

(it isn't cm² because that is for area and we are calculating perimeter)