The correct answer to this open question is the following.
This is a 6th-grade science class taught by teacher Helen Roberts. What the teacher does as students enter the classroom is to write expectations of the whiteboard so students can read as soon as they enter the classroom. Students cal also read some instructions about the class so they can get familiar with the method. Then, the teacher asks some students to read the information aloud so everybody can hear it, and if there are questions, that is the right moment to ask.
Every teacher has its own method to introduce him/her and introduce its class. The important thing is that the teacher makes a good and immediate impact on the class.