exam Maths Puzzle Numerical Ability

logx+log14

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4i^7 - the square root of -5 times the square root of -5 + the square root of 7 times the square root of -7 - the square root of -16
The Keiko Construction Company is building a house. They need to dig a rectangular basement. It will have a length of 32 feet, a width of 24 feet, and a depth of 8 feet. How much dirt must be removed?