It should be 12×18. 1:3 means you take where it's at, at 1 and multiply it's size by 3.
The answer is C 7
Hope this helps
Side length: 2 cm.
Volume of a cube:
V=a^3
(where V is volume, and a is side length)
If v=8, the formula would now be 8=a^3
Take the cube root of both sides
a=2.
I can help! Do you have an example problem that I can show you step by step?