exam Maths Puzzle Numerical Ability

I need to know the symmetry of any circle with center (0,0)

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exam Other Question

if f(x)=4x-3 find the following:
f(-1) If the perimeter of a rectangle is 18 ft and the width is 6 ft, find its length. [Hint: The perimeter of a rectangle is given by P = 2L + 2W.]