exam Maths Puzzle Numerical Ability

Yossi is building a fence for his yard. he is considering the two designs shown. the boards are cut so that the long sides are parallel. the boards will be nailed to the horizontal

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"A box with a square base and no top is to be made from a square piece of cardboard by cutting k in. squares, where k = 3, from each corner and folding up the sides, as shown in th the square of a number is the second power of the number. the cube of a number is the third power of the power. Explain why these names are reasonable?