Surface area is the area of all the sides added up. If you were to unfold all the areas and make it flat (2-D), area is

.
Volume would be cubed because it's 3-D
D. It is non-linear because the output values are increasing at different rates
(3x-5)(2x-7)
6x^2 - 21 x -10x +35
6x^2 -31x +35
The first one
50 because 80+50+x=180 (inside triangle) x=130 180-130= 50 (angle outside triangle)
If the series is A B C D then the next one is E