Answer:
i may not have the explanition but its 21.35
The surface area is the sum of the area of the six sides...
A=2(xy+xz+yz)
A=2(8*3+8*5+3*5)
A=2(24+40+15)
A=2(79)
A=158 cm^2
Answer:

Step-by-step explanation:

Add 7 to both sides:
Multiply both sides by -1:
Divide both sides by 5:
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Answer:
30
Step-by-step explanation: