Answer: 216cm[tex]x^3[/tex]
Explanation:It's 21cm[tex]x^3[/tex] because if you add 48+48 that will give you 96cm[tex]x^3[/tex], then add 96+40 that will give you 136[tex]x^3[/tex], then you add 136+40 that will give you 176cm[tex]x^3[/tex], then you add 176+20 that will give you 196[tex]x^3[/tex], then you add 196+20 that will give you your answer: 216cm[tex]x^3[/tex]
