How many unique ways are there to arrange the letters in the word song

Weak battery is considered to be a part of routine a. inspection b. wear and tear c. maintenance d. check

Asocial networking site currently has 400,000 active members, and that figure is predicted to increase by 32% each year. the following expression represents the number of active members on the site after t years.

Ammonia molecules have three hydrogen atoms and one nitrogen atom.how many of each atom arein five molecules of ammonia