Answer: 242
Explanation: you are trying to find the surface area. The formula for surface area is: Surface Area=2(width x length)+2(length x height)+2(height x width)
Since the question gives us the values of height, length and width. Just fill the information into the formula.
Surface Area=2(7x10)+2(10x3)+2(3x7)
Solve the parentheses:
Surface Area= 2(70)x2(30)+2(21)
Distribute the 2 into the parentheses:
Surface Area=140+60+42
Solve:
Surface Area=242
