What is the x intercept of the line? (-21,-64) (-15,-48) (-9,-32)

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

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?

Aubrey read 29 books and eli read 52 books what number is equal to the number of books aubrey read?