Problem 1: Evaluate the sigma notation below: [(x2 -3x+1) x=0 Problem 2: Cell phone plans and subscriptions picked up around the turn of the 21st century. The table below shows the number of cell phone subscriptions over a 7-year period. Year Subscribers (millions) 2001 128.4 2002 140.8 2003 158.7 2004 182.1 2005 207.9 2006 233.0 2007 255.4 a. Is this representative of growth or decay? b. Find an exponential regression equation for the data, rounding all values to the nearest thousandth. c. How many subscribers would you expect in 2015? d. True or false: If graphed, with time as the independent variable and subscribers as the dependent variable, this data would fit to a straightline. Problem 3: For the GEOMETRIC sequence below: 78, 39, 19.5, ... a. Find r b. Find the 6th term c. Find the sum of the first 10 terms Problem 4: For the ARITHMETIC sequence below: 100, 96, 92, ... a. Find d b. Find the 134th term c. Find the explicit formula for the nth term. d. Find the sum of the first 200 terms