exam Maths Puzzle Numerical Ability

Use the properties of addition and multiplication to complete the statement.
18 • 4 = 4 • ____
Not sure how this is done at all, help please.

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exam Other Question

"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 Solve in tems of x?

3^(x/2) + 2^x > 25