Find the surface area of each rectangular 5. $\ell=7 n, w=2 n, h=\frac{1}{2} n$

Step 1 ：Given a rectangular prism with length (l) = 7n, width (w) = 2n, and height (h) = 0.5n.

Step 2 ：The surface area (A) of a rectangular prism is given by the formula \(A = 2lw + 2lh + 2wh\).

Step 3 ：Substitute the given values into the formula: \(A = 2(7n)(2n) + 2(7n)(0.5n) + 2(2n)(0.5n)\).

Step 4 ：Simplify the expression to find the surface area: \(A = 37n^2\).

Step 5 ：Final Answer: The surface area of the rectangular prism is \(\boxed{37n^2}\) square units.