Hi Steve, reflection questions and teacher-only answers exist in Code Studio. If, while signed in as a teacher account, you don’t see the blue box below the reflection question (for example) here: https://studio.code.org/s/cspunit1/stage/14/puzzle/5
then you’ll need to request for validated teacher access, which you can do here by filling out this form.
On this lesson in particular (Sending Numbers) there are no solutions to the reflection questions because these reflection questions focus on instances of collaboration and problem solving, which will be unique to each student.
Hope that helps!
Sarah