Arectangular prism has a height of 3,a length of 4,and a width of 12,what is the surface area?

The formula for the surface area of a rectangular prism is 2 (wl + hl + hw)

So first we multiply the width by the length.
12 x 4 = 48
Now we multiply the height by the length.
3 x 4 = 12
Now we multiply the height by the width.
3 x 12 = 36
Now we add all of our answers together.
48 + 12 + 36 = 96
And now we multiply it by 2.
96 x 2 = 192

So the surface area of the rectangular prism is 192.