Silvia e rebecca acquistano on line 10 cubi di polistirolo da rivestire di stoffa. le dimensioni di ogni cubo riportate nel sito sono 150x150x150mm.
possono essere sufficenti 2m^2 di stoffa?
si perché?
no perché?

I translate the task in english "Silvia and Rebecca buy on line 10 cubes of styrofoam to coated fabric.The size of each cube contained in the website are 150x150x150mm.May be sufficient 2m^2 of cloth?You why?No why?"

We need to find the area of full surface of cube. The formula is 6 * A^2.
150mm=15sm=0,15m.

0.15^2=0.0225 m^2 of fabric for one side.
Cube have 6 sides. 
6*0.0225=0.135 m^2 of fabric for one cube.

And we need to cover 10 cubes, so we must to multiply 0.135 by 10.
10*0.135=1.35 m^2.

it's enough of 2 m^2

It should be a or d i’m not sure