Haley's employer has asked her to review tens of thousands of social media posts about their company's products and compile this data into a database. In terms of the characteristics of big data, Haley is dealing with .
a. NA
b. variety
c. velocity
d. veracity

It may possibly be c i think |-/

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.