RU Hungrys General Manager is performing some longer range planning and is interested to know what the forecasted demand will be over the next one year time horizon. Using simple linear regression as your forecasting technique, please provide your demand forecast for periods 18, 19, 20 and 21.

RUHungry Banquet Hall Guests Served by quarter since January 2017.

Calendar Year	Quarter	Period #	Guests Served
2017	1	1	3,500
	2	2	8,300
	3	3	5,400
	4	4	9,050
2018	1	5	4,300
	2	6	5,800
	3	7	3,300
	4	8	5,800
2019	1	9	5,200
	2	10	9,300
	3	11	7,700
	4	12	15,300
2020	1	13	13,500
	2	14	17,500
	3	15	12,800
	4	16	18,300
2021	1	17	13,600
2022	2 3 4 1	18 19 20 21	???? ???? ???? ????