Do you have answer choices?
The surface area is the area of the outside of a 3D shape for example, let’s say you have a cube, a cube has 6 sides, so you have to find the area of each side and then add it up, since it’s a cube you would technically have to find the area of one side and then just multiply it by 6, that would be the easiest way to do it
Hope I helped!
I think its c
Step-by-step explanation:
The new mean age will be greater than 14.2 years because the teacher is older than the previous mean.
