exam Maths Puzzle Numerical Ability

If the angle of rotation with respect to lines l and m measures 30�, then l and m intersect to form an angle of

these are the choices:
1) 90�
2) 60�
3) 30�
4) 15�

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exam Other Question

Please help me find the formula to this sequence with a variable difference.
-1, -1, 0, 2, 5, 9, nth term.

I know the difference increases by one (+1)for each succeding term, THis is the best I can type it out. I hope you understand it. 6x to the second power y to the third power + 9x to the second power y to the third power. divided by 3x to the second power y by the second power. Simplify it. It looks sort of like this.