An artist is arranging tiles and Rose to decorate a wall each new role as to if you were tiles in the row below it the first row has 23 tiles how many tiles will be in the seventh row
2 * 7 = 14 (the number of tiles for each row) 23 - 14 = 9 (the number of tiles subtracted from how many tiles that are taken away) 9 tiles are in the seventh row.
