[volume of a cube]=b³---------> b=∛Volume b------> is the side length of a cube
The top block was 64 cm³------> b1=∛64-------> b1=4 cm The middle block was 125 cm³------> b2=∛125------> b2=<span>5 cm T</span>he biggest block was 729 cm³------> b3=√729------> b3=<span>9 cm
[</span><span>the stack of blocks tall]=b1+b2+b3-------> 4+5+9-----> 18 cm </span><span> the answer is </span>the stack of blocks was 18 cm tall<span>