exam Maths Puzzle Numerical Ability

i do not understand how to solve them. how do you solve the questions algebraicly

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Solve then graph 7x_>28
Of course the _ is supposed to be under the > Would it be a clear, or solid circle when graphing it? The circle radius has 5 and center (1,2). AC is a parallel to the x-axis. BC is parallel to the y- axis. What are the lenghts of AC, BS, AB in terms of X and Y