book Maths Puzzle Numerical Ability

"state the values of x, if any, for which each expression does not name a real number."
#28. radical:x+1 (I don't know how to make a radical sign on the computer)

I'm totally c

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book Other Question

A top spins 200 revolutions/minute. Find the angular velocity in radians/second. This problem has to do with permutations:Let n = 9
sigma = (2 3 7 5 6) and mu = (1 8 9 4)
1. Compute sigma of mu and mu of sigma
2. Compute sigma-squared and sigma-cubed.