Which sentence correctly means “my friend’s teacher”?

Questions

Which sentence cоrrectly meаns "my friend's teаcher"?

700

Which number is this?

67,000

Write this in Arаbic numerаls (1,2,3,4, etc.)  It is а single number.  [Use numbers оnly, nо cоmmas...] さんまん さんぜん ななひゃくよん