Piano Answers

I am a college student doing a project on American education. I listed these questions & am curious of your answers. All the schools are referring to average public schools. Your answers can be based on your knowledge as a parent or something you heard from a friend or read in the news. Your answers can be true nationally or just locally (please specify your geography).
Thank you!
1. What do children learn at elementary schools in general? (e.g basic math, reading, writing, social skills?)
2. How many hours do students spend in school per week? Does it change as the kid proceeds into higher grade?
3. Are there any areas that the elementary schools specifically are concerned about? (do they have a huge emphasis on science? Sports?)
4. How many students are there in one class? What is the teacher/student ratio? Does it change as the kid proceeds into higher grade?
5. What is the average parents’ involvement with the teachers that the school expects? Does it change as the kid proceeds into higher grade?
6. What is the tuition per quarter? Does it change as the kid proceeds into higher grade?
7. How much do you think parents in average families spend on their kid’s education outside of school? (such as on piano lessons,etc.)