book Maths Puzzle Numerical Ability

Prove that (2x-1)^(1/4)= -1 has no solution at all

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book Other Question

please help i really don't get this...i've tried to figure it out but i don't know where to start.
Complete the sequence: 19, 5, 17, 21, 5, 14, 3, ____. Explain your answer.
4/x^2 + 3/x -10 = 0

6 + 4/x-1 = 5/x-3

3.5x + 4.6/x = 1.2

Can anyone help me?!