exam Maths Puzzle Numerical Ability

I am needing some help on this question

6 ≤ 3t - 3 ≤ 21

I know there is a 3 and 8 however what order or -/+ sign I am lost.

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exam Other Question

Find the roots of z^6=1 for z complex. Show that the sum of the roots you found is zero. Find the roots of the equadratic equations by the method of completing the square. Express the roots, if they are not rational, in simplest radical form.

3x2 - 2x - 5 = 0