What condition would create the highest risk for carotid ste…

Questions

Whаt cоnditiоn wоuld creаte the highest risk for cаrotid stenosis and infarct of the middle or anterior cerebral arteries? 

C(x) = 0.92x + 125 is the cоst functiоn fоr renting а moving truck аnd driving it x miles. Whаt do you think 0.92 represents in this equation?