Please explain and show all work.

Visual approach

Using a quick and dirty visual approach estimate the sales in October, November, and December of 2015, and January 2016

Estimate the range for the forecasted sales values

Month	Sales	Month	Sales	Month	Sales
Oct-12	0.44	Oct-13	29.83	Oct-14	34.98
Nov-12	5.34	Nov-13	18.86	Nov-14	45.54
Dec-12	(1.03)	Dec-13	19.53	Dec-14	49.92
Jan-13	4.22	Jan-14	20.01	Jan-15	48.87
Feb-13	15.44	Feb-14	34.02	Feb-15	58.15
Mar-13	1.39	Mar-14	32.11	Mar-15	51.01
Apr-13	8.28	Apr-14	28.38	Apr-15	58.33
May-13	13.08	May-14	32.16	May-15	58.84
Jun-13	7.25	Jun-14	42.91	Jun-15	49.97
Jul-13	9.20	Jul-14	34.38	Jul-15	58.95
Aug-13	26.30	Aug-14	40.54	Aug-15	49.61
Sep-13	21.78	Sep-14	30.43	Sep-15	56.40