Including jose, there are 8 people in his family. if order matters, how many ways can he arrange his family members into a row if jose must sit in the first seat?

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

Does the point (1, sqrt 7) lie on circle shown.

Aclassmate thinks that solving a system by graphing gives an exact answer when the lines appear to cross at a grid point, but only an approximate answer when they don't. explain why this isn't true.