Weekly numbers weeks 1 through 4

Predicting Blockbusters: Weekly Movie Grosses and Exponential Sequences Studies have shown that weekly U.S. gross box office receipts the total dollars collected in ticket sales for all showings of a particular movie title in a particular week across the country closely follows an exponential model of the form x[n] Ka", where (n + 1) is the week number?, K is the ideal first week gross box office receipts and a determines how the amount earned drops each week, where ()