Solving equations simple
9n + 12 = 30
I believe the answer is 311.157055138. That is if i did my math correctly. I hope this helps. Good luck!
The answer for both of these would be a rectangle.
A rectangular prism has 6 faces, all of which are rectangles. Slicing the prism parallel to any of the faces, whether they are end faces or bases, will result in a rectangular cross-section.
