How many languages are in the world?

Miguel is making an obstacle course for field day. at the end of every sixth of the course, there is a tire .at the end of every third of the course, there is a hurdle. at witch locations of the course will people need to go through more than one obstacle?

What did the study in nicaragua show about the connection between language and numbers, and how does language enable one to understand numbers?

Which letter represents the atomic number? a) a b) b c) c