exam Maths Puzzle Numerical Ability

Hi. Can someone please help me? I need to solve these arguments using the 18 rules of inference. I'm stuck on these 4.

I. 1) [A horseshoe (B v C)] horseshoe (D horseshoe A)

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exam Other Question

Use this table to answer my questions:
Population of Europe by age groups (in thousands) in 1950, 1970, and 1995 was:
Age 0-14: 143,175;166,367;139,464
Age 16-64: 359,162; 421,4 two consecutive postive integers sum of squares is 85