Show problems. 1. [4 marks] The number of customers at a famous Waterloo eatery has been decreasing at an almost linear rate. There were 65, 000 customers in January 2018: 21, 000 customers in January 2021. If s is the customer count per year and t is the time in years (t = 0 in January 2018), then: (a) Determine the linear estimating function s = f(t). (b) Interpret the slope's significance. (c) If customer numbers continue to decline at the current rate, in what year will the eatery be without customers