Help me please don’t know this I’m new to it

Answer:
The surface area would be 28 square feet.
Step-by-step explanation:
To solve this, input the values for each of the variables every time you see it. l = length, w = width and h = height.
SA = 2lw + 2hw + 2hl
PART 1
2lw
2(2)(1)
4
PART 2
2hw
2(4)(1)
8
PART 3
2hl
2(4)(2)
16
PART 4
SA = 4 + 8 + 16
SA = 28