exam Maths Puzzle Numerical Ability

Find the roots of z^6=1 for z complex. Show that the sum of the roots you found is zero.

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exam Other Question

Find all positive values for k for which each of the following can be factored.

x(squared)+ x-k

thanks 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.