exam Maths Puzzle Numerical Ability

If PQ =21cm and QR= 5cm then what are the possible lengths for PR so that (line over)PQ, (line over)QR, and (line over)PR can form a triangle? Explain your reasoning.

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exam Other Question

Given the point (2,-4) and a slope of -1/2 find the equation of a line having this slope and point. Show that e^(z) has NO zeros.

I know z = x + iy, so e^(x+iy) = e^(x)*e(iy).
I'm not sure where to go from here if I set this last equn to zero.

I also need help finding the