Find the surface area of an open box with length of 12 inches, width of 7 inches, and height of 4.5 inches

339 inches ²

Step-by-step explanation:

First, the formula of a rectangular prism is ...

2 (wh+lw+lh)

*witch means 2 (with x height + length x with + length x height) *

So, the equation would be ...

2 * (12*7 + 12*4.5 + 7*4.5)

Which answers to 339.