The answer is +12 because you add on 12
Answer:
Surface area of the rectangular prism= 
Step-by-step explanation:
Given Dimensions of the rectangular prism are:

Surface Area of a rectangular prism=

=
The surface area of the rectangular prism is 
The following is a relation because each x doesn’t only have one y; the following is a relation because two Ys have the same X
In intercept form, the plane that has these intercepts is ...
... x/(x-intercept) + y/(y-intercept) + z/(z-intercept) = 1
... x/1 + y/(-1) + z/2 = 1
... 2x -2y +z = 2 . . . . . in standard form