Final answer:
The area of the rectangular metal plate can be found by multiplying the length and width of the given region.
Step-by-step explanation:
To find the area of the rectangular metal plate, we need to find the length and width. The given region is [0,1] x (1,4), so the length is 1 - 0 = 1 and the width is 4 - 1 = 3. Therefore, the area of the plate is 1 x 3 = 3 units squared.