Juanita has 55 postage stamps.Each week she mails 4 letters to her pen pals.What number represents the change in the number of Juanita's stamps after 8 weeks?

Hi Again Chris;

The short technique...

(55)-[(8)(4)]

55-32=23

The long technique...

FIRST WEEK...55-4

SECOND WEEK...51-4

THIRD WEEK...47-4

FOURTH WEEK...43-4

FIFTH WEEK...39-4

SIXTH WEEK...35-4

SEVENTH WEEK...31-4

EIGHTH WEEK...27-4

23