Answer:
third expression
Explanation:
the surface area (SA) is the area of the 6 faces.
Note that opposite faces are congruent.
the surface area is the the area of each face multiplied by 2 , since they are congruent.
SA = 2(front area ) + 2(side area ) + 2(area of base)
= 2(5 × 7 ) + 2(4 × 7 ) + 2(4 × 5 ) ← third option
= 2(35) + 2(28) + 2(20)
= 70 + 56 + 40
= 166 cm²