A cylinder has a bore of 6.2311 in, and a stroke of 6.3311in, and a combustion chamber volume of 22.56 cu. in. What is the compression ratio? a. 22.56
b. 9.65
c. 9.55

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

It really doesn't matter for any of the questions that you've listed.

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.