Having trouble with this homework problem.

An economist computed a least squares line to predict in a particular city the monthly office rental cost (in dollars per square foot) from the vacancy rate (percent of vacant office space). The equation was sC #!% #*&B C B , where is the monthly rental cost and is the vacancy rate. In a particular month when the vacancy rate was 17% ( 17) B , the actual monthly rental cost was $14.29 per square foot. The value of the residual for this month is: a. 1.095 b. 2.71 c. 1.095 d. 0 e. 14.29