2 & 3 must be true.
1 may be true at times but not always e.g. when x = -1
4 is false as square root of a positive number (i.e. square of a negative number) can not be negative because a radical sign is being used.
2 is always true as a square of a negative is positive whereas a cube will always be negative. So it would always be less than a positive no.
3 is always true as sum of two negatives will always be negative. Hence less than zero.