Our model is
[tex]\hat{y} = 2.17 x + -114.05[/tex]
When x=82 degrees F,
[tex]\hat{y} = 2.17 (82) + -114.05 = 63.89[/tex]
We round up to
Answer: 64 bags
Not sure why it says y^=34 in the question; I'm ignoring that.
The residual is the difference between the actual y and the predicted y,
[tex]e = y - \hat{y} = 66 - 64 = 2[/tex]
Answer: 2