Find the surface area of each rectangular pris 3. $\ell=10 \mathrm{~mm}, w=4 \mathrm{~mm}, h=5 \mathrm{~mm}$

Step 1 ：Given a rectangular prism with length \(l = 10\) mm, width \(w = 4\) mm, and height \(h = 5\) mm.

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

Step 3 ：Substitute the given values into the formula: \(2(10)(4) + 2(10)(5) + 2(4)(5)\).

Step 4 ：Calculate the surface area: \(80 + 100 + 40 = 220\) square millimeters.

Step 5 ：Final Answer: The surface area of the rectangular prism is \(\boxed{220}\) square millimeters.