Periodic energy usage. the 168-vector w gives the hourly electricity consumption of a manufacturing plant, starting on sunday midnight to 1am, over one week, in mwh (megawatt-hours). the consumption pattern is the same each day, i. e., it is 24-periodic, which means that wt+24 = wt for t = . let d be the 24-vector that gives the energy consumption over one day, starting at midnight. (a) use vector notation to express w in terms of d.