Power Systems
The total number of strands(N) is concentrically stranded cable with total annular space filled with strands of uniform diameter is given by (if x is number of layers)

 N = 3x²+3x+1
 N = 3x²-2x+1
 N = 3x²-3x+1
 N = 3x²-6x+1

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Power Systems
An hydro-graph indicates

 the discharge at any time during the period under consideration.
All of these
 the average run off during the period.
 the maximum and minimum run off during the period.

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