book Maths Puzzle Numerical Ability

Please help me solve this problem.

36-8/2
(36-8)/2

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book Other Question

please show me howto combine like terms in each of these expressions, thanks
(10x^3+6x^2+4x)-8x^3+2x^2-3x
(5x^2+6x+8)(6x^3+2x^2-4x)
8x^2+6x^3+2x+5x Show that the sum of any 5 consecutive counting numbers must have a factor of 5