exam Maths Puzzle Numerical Ability

How would I find all the 7-th roots of -1+i and plot them on an Argand diagram? Thanks, Simon

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exam Other Question

A boat travels 65 miles downstream in 5 hours and 15 miles upstream in 3 hours. Fin the ordered pair that tells the speed of the boat, (b) and the speed of the current, (c) if my problem was5x+9=39 and i had to do five steps how would i solve this problem