Find the surface area of each rectangular prism given its length, width, and height. choose the correct answers.
l = 4 cm
w = 9 cm
h = 3 cm
sa = 150 cm2
l = 7 cm
w = 3 cm
h = 4 cm
sa = 132 cm2
l = 8 cm
w = 5 cm
h = 5 cm
sa = 190 cm2
l = 5 cm
w = 7 cm
h = 6 cm
sa = 214 cm2

To answer this question we have to go through each answer, and use this equation:
(a = area, w = width, l = length, h = height)
a=2(wl+hl+hw)
to solve, and see if it's correct.

A) a=2(9·4+3·4+3·9) = 150
Correct!

B) a=2(3·7+4·7+4·3) = 122
Incorrect.

C) a=2(5·8+5·8+5·5) = 210
Incorrect.

D) a=2(7·5+6·5+6·7) = 214
Correct!

The correct answers are A, and D. 

Hope this helped! Please comment or DM me if you have anymore questions. :)

Add them all up, 3.2 + 1.75 + 1.9 = 6.85

The total weight is 6.85 pounds.