Answer:
The missing value is 21 cm.
Explanation:
To solve for the missing value, we can rearrange the equation:
21 cm^3 = (1/3) * 3 cm^2 * x
First, simplify the right side of the equation:
21 cm^3 = 1 cm^2 * x
Now, isolate the variable by dividing both sides of the equation by 1 cm^2:
21 cm^3 / 1 cm^2 = x
The units cancel out, leaving us with:
21 cm = x
Therefore, the missing value is 21 cm.