exam Maths Puzzle Numerical Ability

the graph of f(x)=-5 falls in what quadrant(s)?

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exam Other Question

5x^3-5x+1/x-3

This was my solution

5x^2+10x r 31/x-3

x-3 /5x^3-5x+1
-5x^3-15
+10+1
-10+30
+31/x-3

Is this correct? the length of a rectangle is 2 in. morethan twice its width. If the perimeter of the rectangle is 34 in., find the dimensions of the rectangle.