Solve the following inequation, write down the solution set and represent it on the real number line.

-3 + x ≤ $\dfrac{7x}{2} + 2$ < 8 + 2x, x ∈ I.

Solve the following inequation, write the solution set and represent it on the real number line.

5x - 21 < $\dfrac{5x}{7} - 6 \le -3\dfrac{3}{7} + x$, x ∈ R.

One-third of a bamboo pole is buried in mud, one-sixth of it is in water and the part above the water is greater than or equal to 3 metres. Find the length of the shortest pole.

If x ∈ {-3, -1, 0, 1, 3, 5}, then the solution set of the inequation 3x – 2 ≤ 8 is

1. {-3, -1, 1, 3}
2. {-3, -1, 0, 1, 3}
3. {-3, -2, -1, 0, 1, 2, 3}
4. {-3, -2, -1, 0, 1, 2}