book Maths Puzzle Numerical Ability

Could you please help me with these problems. I 'm not sure if I'm doing them right.
1. x^3 > 8

2. x^3-x^2-4x+4 < 0

3. 3x^2-7x+2 < 0
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x+1
4. Assume that a

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book Other Question

An Airplane leaves Los Angeles for Denver at a speed of 410 mph. Thirty minutes later, a plane going from Denver to Los Angeles leaves Denver, which is 850 miles from Los Angeles, What do the inequality signs mean?