exam Maths Puzzle Numerical Ability

A regular octagon is inscribed in a circle of radius 15.8 cm. Find the perimeter of the octagon.

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exam Other Question

I have a triangle of 9 small triangles then 7 on top of those then 5 on top of that then 3 then 1. How many tooth picks are needed to form the mth triangular grid pattern? I dont even know where to start

Find the value of the polynomial x3 - 4x when x = -2.

A) -2
B) 0
C) 2
D) 14