The formula to find the surface area for a rectangular prism is
=2+2ℎ+2ℎ
S
A
=
2
l
w
+
2
w
h
+
2
l
h
=2+2ℎ+2ℎ
S
A
=
2
l
w
+
2
w
h
+
2
l
h

What is/are the independent variable(s) for the formula?