book Maths Puzzle Numerical Ability

Use the properties of Logarithms to evaluate:
Log sub3 9+Log sub3 36-log sub3 4.

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book Other Question

Use Eular's formula to find the number of edges in the polyhedrn made up of 5 faces: 2triangles and 3 rectangles. I was wondering if you could help me with this problem. This one is on dividing rational expressions.

3x^2(x-4y)-20x(x-4)+25(x-4y)Over 3x^2(4y-x)-14x(4y-x)-5(4y-x) / 4x-1 Over 3x+1