Simple. I assume the ones going to the middle school are currently in 5th grade at the elementary school. You have 126 coming into the middle school from each school. You need to multiply 126 by 4. You get 504. There will be 504 new students at the middle school.
Choice D is correct. "<span>There are a lot of people working together to create a song, including songwriters, producers, recording artists, and others." Hope this helps!</span>
