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If a fist is 25g and it takes 400N of force to crack a board how fast will you have to accelerate your arm to crack the board?

A regular octagon is formed by cutting off the corners of a square. If one side of the square is n cm, find the total area removed in square cm.

A rectangular garden is to be fenced along four sides and is to be divided into three parts parallel to two of its shorter sides. Find the dimensions of the garden if the length is twice its width and the total fencing materials is 104m.

A square has an area of 27 square units. If the perimeter of the square is equal to the perimeter of an equilateral triangle, find the area of the equilateral triangle.

A rectangular garden of dimension 12m by 9m is enclosed by a uniform concrete walk 1.5m wide. If the walk is to be tiled, how many 30cm- square tile are needed to tile the entire walk?