Ruth has some dice shaped like cubes. Each one has a volume of 64 cubic units. How long is each edge?

To find the length of each edge of a cube when you know the volume, you can use the formula for the volume of a cube, which is:

[

text{Volume} = (text{edge length})^3

]

Given that the volume is 64 cubic units, you set up the equation:

[

64 = (text{edge length})^3

]

To find the edge length, take the cube root of both sides:

[

text{edge length} = sqrt[3]{64} = 4 text{ units}

]

So, each edge of the cube is 4 units long.