Answer:
β30-2β5m
Step-by-step explanation:
You can start by figuring out the side length of a cube with the respective surface areas.
Given the equation S=βSA/6, you can start with the 180m^2 cube, and plug the values in.
S=β180/6
S=β30
Next, you can do the same thing with the 120m^2 cube.
S=β120/6
S=β20
S=β4*5
S=2β5
In order to find how much longer the first cube is, you should subtract the side length of the second cube from the first.
You should get: β30-2β5m
Hence, the correct answer is B.