bus and subway ridership for the summer months in​ london, england, is believed to be tied heavily to the number of tourists visiting the city. during the past 12​ years, the following data have been​ obtained: year 1 2 3 4 5 6 7 8 9 10 11 12 number of tourists​ (in millions) ridership​ (in millions) this exercise contains only parts​ b, c,​ d, e, and f. part 2 ​b) the​ least-squares regression equation that shows the best relationship between ridership and the number of tourists is ​(round your responses to four decimal​ places):