there are 15 dogs. 22 cats, and 4 rabbits at a shere.
each dog needs a collar, a bowl, and a toy. each cat need
a collar and a bowl. in addition, one scratching post is
needed for all of the cats. each rabbit needs a bowl. write
an expression is simplest form to show the total number
of collars c, bowls b, and toys t, that the animal shelter
needs for its resident animals.