exam Maths Puzzle Numerical Ability

A ladder 5m long is leaning against a wall 12m high. The foot of the ladder is 4m from the base of the wall.The distance,in m,from the top of the ladder to the top of the wall is:

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FIND THE RANGE OF VALUES OF a(an element of R)for which z+a*(mod of (z-1))+2i=0,where z=x+iy has a solution.also find the solution the resistance of an electric wire is directly proportional to the length of the wire and inversely proportional to the square of the diameter. Write a formula expressing this property using R for resistance, L for length, and D for diameter.