D because if you multiply y 8 times it will no longer be doubling the area
Answer:

Step-by-step explanation:
The surface area of the triangular prism consists of three rectangles and two triangles.
Rectangle One - 5 x 12 = 60 cm^2
Rectangle Two - 4 x 12 = 48 cm^2
Rectangle Three - 3 x 12 = 36 cm^2
Triangles - 2 x 1/2 x 3 x 4 = 12 cm^2
Thus, the total surface area of the solid is 
Answer:20
Step-by-step explanation:
It's D)
you can subsitute any number you want for x and it'd still be a soloution to y=