I do not understand how to solve Problem #4.

Problem #3 A computer assembly company can get volume discounts if it buys parts in high enough volume. They want to compute a parts forecast using exponential smoothing and the data below. The forecast should be computed using smoothing constants of a = 0.30 and a = 0.50. Demand for Personal Computers Period Month Demand 1 37 January February 2 40 3 March 41 4 April 37 5 May 45 6 June 50 7 July 43 8 August 47 9 September 56 10 October 52 11 November 55 12 December 54 Problem #4 Using the data from the exponential smoothing example, compute the a- and b- coefficients for a linear trend line