book Maths Puzzle Numerical Ability

please tell me the proof for this question that Complex numbers and real Numbers are same numbers( I mean if we show complex numbres with C and real numbers with R we have : C~R )

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book Other Question

please solve the following inequalities as i am having some difficulties:

4x + 12 >= 36 + 4

8z + 4z < 6z - 12

thank you :) hi i need help for this equation and how to to arrive at the answer.

solve (find values) for A, B, C, D, F

(x^4 - 4x^2 - 7x - 28) = A(x^B + C)(x^D - F)