Answer:
Step-by-step explanation:
4*2=8, thats one rectangle (side)
8*2 is 16, thats TWO rectangles (sides)
7*4=28, thats one rectangle (front)
28*2=56, thats TWO rectangles (front and back)
7*2=14, thats one rectangle (top)
14*2=28, thats TWO rectangles (top and bottom)
add all of these surface areas together
TWO rectangles + TWO rectangles + TWO rectangles
28+56+16=100
As you can see, the 60cm2 is incorrect. 100cm2 is the real surface area of the shape
