What is the difference between the signs for the numbers 1-9 and the signs for the numbers 10-19?

When should you use encyclopedias such as wikipedia? a. never, it is not appropriate to use this source in college b. it can you get an overall understanding of the subject matter but is not considered a college-level source c. as long as wikipedia isn't the only source, it is always appropriate to use this source

What do the words spoken by the mouse in paragraph 3 tell us about her character?

By comparing part 1 and 2 of polar opposites what does it mean by polar opposites