How much water remains unfrozen after 59.8 kJ is transferred as heat from 360 g of liquid water initially at its freezing point

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

If the heat engine is a perfect carnot cycle engine, thenefficiency = (t2-t1)/t2   where t1=temperature of cold reservoir ( ° k) = 135            t2=temperature of hot reservoir ( ° k)   = 325thereforeefficiency = (t2-t1)/t2 = (325-135)/325 = 0.5846 = 58%  note: this is the theoretical maximum efficiency of a perfect heat engine.   real-life engines do not achieve this value.