exam Maths Puzzle Numerical Ability

8
_____

2+i

I know I need to divide this. The i always throws me off. is it 4 + i?

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exam Other Question

Two lines have slopes 2k-4 and k+6. What value(s) of k will produce perpendicular lines? I think the answer is k=-4+or- sqrt66/2???????? [2c+4.5d]-[-1.5c+1.5d]