4}'an analysis was made on the cost in dollars related to electrical consumption in Kw, the energy needed and the average temperature in \"F. The results table is shown below: _ cost in dollars Energv used Joules m- was: 1828 as 333 49' a] Determine the multiple regression equation bj'what is the cost for a house that has a consumption of 2,500 kW, the heating energy is 1,800jouies and the average temperature is 50 \"F? c) Determine the standard error of multiple estimation. d) Determine the coefficient of multiple determination