Hi there!
The formula for the volume of a rectangular prism is length x width x height. Using this formula, we can plug in the numbers given, multiply them together, and find the volume of the prism.
WORK:
V = 6 x 1 x 3
V = 6 x 3
V = 18cm^3
Hope this helps!! :)
If there's anything else that I can help you with, please let me know!