Respuesta :

Answer:

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.