Which statement is true about the residual plot below? No regression model is appropriate for the data.
3
A quadratic model is appropriate for the data.
2
1
.
.
A linear model is a good fit for the data.
0
2
3
4.
5X
.
The sum of the residuals is greater than zero.

Sarah took the advertising department from her company on a round trip to meet with a potential client. including sarah a total of 11 people took the trip. she was able to purchase coach tickets for $280 and first class tickets for $1280. she used her total budget for airfare for the trip, which was $6080. how many first class tickets did she buy? how many coach tickets did she buy?