exam Maths Puzzle Numerical Ability

Please help me with these problems.I cant figure them out.

SIMPLIFY EACH OF THE FOLLOWING.BEGIN WITH THE INNERMOST PARENTHESES.


1). (8x-y)-[-(2x + y)-(3x-6y)]


2). 6

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exam Other Question
Express the sum 1x2 + 2x3 + 3x4 + 4x5 + ... + 10x11 in summation notation. The length of a rectangle is 5 less than thrice its width. Find the dimensions if the area is 112 squared cm.