Mr. bailey is the principal of the school with 465 students and 44 teachers. the librarian told mr bailey that there were 16 times as many books in the library as their students in the school. how many books are in the library?

Solve 2x+y=3 x+y=5 in substitution method

Liz is shipping a package to her friend.the maximum weight of a medium flat-rate box is 20 pounds,including the box which weighs 6 ounces.write and solve an inequality to describe the possible weight ,w, of the contents that liz will ship to her friend if she must use a medium flat-rate box.

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