book Maths Puzzle Numerical Ability

Solve each compound inequality and write the solution set using interval notation.

a) 3<5x/2 +4 is less than or equal to 12 AND 2x > 3x/2 +1/8

b)

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book Other Question

(x+2/x-2) / (x^2-4/2x-4)

I don't even know where to begin on this. Could you help? Use Eular's formula to find the number of edges in the polyhedron made up of 5 faces: 2 triangles and 3 restangles.