exam Maths Puzzle Numerical Ability

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,

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exam Other Question
How do you get the angles of a triangle when you are given the lengths of the sides? 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°