An example of an is where Sylvania provides lightbulbs that, one might assume, are safe to use and will last for a reasonable amount of time

By sj wilson · 2005 ·  related articlesschool violence prevention programs fell into four broad categories: universal interferes with their efforts to teach. program for children attending any grade, pre-k through 12th 

The independent variable would be the fertilizer as it is what the dependent variable (the growth of grass) depends on.

Pe = 1/2k(x)^2  and .05n/m = .05x10^-9m = x 

Ohm's law tells you that i = v/r where v is equivalent voltage and r is equivalent resistance of the circuit
since all circuits have the same voltage, your question is really asking which circuit has the lowest total resistance, since the lower the resistance, the higher the current
circuit a has a resistance of 5 ohms; circuit c is in series so has a resistance of 10 ohms; circuit b is in parallel and therefore has a resistance of 2.5 ohms (review your notes on adding resistances in parallel and series); therefore b has the highest current