Room registrations in the Toronto Towers Plaza Hotel have been recorded for the past nine years. To project future occupancy, management would like to determine the mathematical trend of guest registration. This estimate will help the hotel determine whether future expansion will be needed. Show the method of calculation and formula to solve the following: a. Given the following time-series data, develop a linear regression equation relating registration to time. Then forecast 2025 registrations

Year	Number of room registration
2015	17
2016	16
2017	16
2018	21
2019	20
2020	20
2021	23
2022	25
2023	24
2025	?