exam Maths Puzzle Numerical Ability

a rectangle has a length of 6 cm. what is its width if its perimeter and area are the same number?

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Tutor could you help me please with this problem?

Determine whether the graph of y=x^3-2x is symmetric with respect to the x-axis, the y-axix, and/or the origin? how can i learn how to do this is a easy way i have a test in two weeks and i just can't get the =0 thing can you please help me? if this is really free.