Question

I need help with base side length of a rectangular prism

Answer 1

Try this solution:
1) if the volume is the same, it means for rectangular prism V=300 cm³.
2) formula of volume is V=S_base*h, where S_base=x² and h=12 cm.
3) if to decide the equation x²*12=300, ⇒ x=5.
Answer: 5 cm.