Find the Volume and Surface Area

Volume = 144 mm^3

S.A = 204 mm^2

Step-by-step explanation:

Volume = Cross sectional area * length

= (1/2 * 6 * 4 ) * 12

=144 mm^3

S.A = Area of all sides

Triangles

2*12 =24 mm^2

Rectangles

5 * 12 = 60 mm^2

6 * 12 = 72 mm^2

4 * 12 = 48 mm^2

therefore 24+60+72+48

=204 mm^2

It is basically a trick question. Firstly we have to ficus on the given formula to get to the answer for this question.

2l + 2w = 16

2(l + w) = 16

l + w = 8

l = 8 - w

Mow w cannot be less than 1. So the length of the rectangle cannot be more than 7. So we can conclude that 7 inches is the correct option or the first option is the correct option among the given options. 

Hope this helped