exam Maths Puzzle Numerical Ability

Solve:(7x-1)^(1/3)= 3, solve for x

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exam Other Question

Can someone please help me solve this problem.
Find the slope of the line passing through the points (4,-4) and (-2,1).

Thank you. (-3 - √-7)^2 Write in standard form.

I got 6 - 2√7i

Thanks for your help!