Calculate the residual of a given situation.

The weekly feed cost for Dianna's iguana is $2.10. The iguana used in a study weighs 11 pounds.

Using the equation = 0.4 + 0.15x for the regression line of weekly food cost on weight (weight is explanatory), what is the residual for Dianna's iguana?

• a.)$2.05
• b.)$0.05
• c.)$0.72
• d.)$1.38