Respuesta :

volume is L*W*H so, it would be (x+6)(x+3)(x)= x^3+18

Answer:

3x+18

Step-by-step explanation:

you first multiple x by x which gets you 2x. Then multiple  it by x again which is 3x. Finally 6 times 3 gets you 18. So the answer is 3x+18.