Determine whether the U.C.C., Article 2, or common law contracts applies to the following transactions with an explanation supporting your response:

1. Temps R Us employs Monica to work at their company.
2. William and Beverly decide to purchase a purebred golden retriever from the Pet Depot.
3. Arnie purchases Mexican tile for his new kitchen in the amount of $3000. The installation for the tiles is $750.
4. Air Conditioning service installs the central air conditioning unit Mrs. Marston purchased from New York Air Conditioners.
5. Parker Jenson hires a Spanish artist to paint a portrait of his father.
6. Parker Jenson purchases a portrait of his father from Spanish artist Salvador.