exam Maths Puzzle Numerical Ability

Describe a system of linear inequalities for which there is no solution

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Here are my problems : a = -1, b = -8, c = 5, d = -1.4

1) |6a|

2) |17c| + |3b - 5|

3) |5a - 7| + |3c - 4|

4) |4d| + |5 - 2a|

Thank-you,
The principal is $2,200. at 12% compounded semi-annually for 2 years. Determine the amount at the end of 2 years.