Answer:
These are the rectangular prisms that have a surface area greater than 140 square feet
6 feet by 5 feet by 4 feet
7 feet by 6 feet by 4 feet
8 feet by 3 feet by 7 feet
Step-by-step explanation:
The formula to find the surface area of a rectangular prism is SA=2(wl+hl+hw)
All you have to do is go through all the options given to you to figure out which retangular prisms have a surface area greater than 140 square feet.
6 feet by 2 feet by 3 feet
SA = 2((2)(6)+(3)(6)+(3)(2))
SA = 2(12 + 18 + 6)
SA = 2(36)
SA = 72
6 feet by 5 feet by 4 feet
SA = 2((6)(5) + (4)(5) + (4)(6))
SA = 2(30 + 20 + 24)
SA = 2(74)
SA = 148
7 feet by 6 feet by 4 feet
SA = 2((7)(6) + (4)(6) + (4)(7))
SA = 2(42 + 24 + 28)
SA = 2(94)
SA = 188
8 feet by 3 feet by 7 feet
SA = 2((8)(3)+(7)(3)+(7)(8))
SA = 2(24 + 21 + 56)
SA = 2(101)
SA = 202
8 feet by 4 feet by 3 feet
SA = 2((8)(4)+(3)(4)+(3)(8))
SA = 2(32 + 12 + 24)
SA = 2(68)
SA = 136
