The following tables give U.S. energy imports, exports, and consumption data and projections (in quadrillion BTUs) for various energy types (with liquid fuels and petroleum abbreviated as LF&P) in selected years.

Let M be the 3 × 3 matrix of import data, E be the matrix of export data, and C be the matrix of consumption data. Find each of the following and indicate what information each provides?
(a) E - M
(b) 1 / 12 C
(c) C + E - M

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Imports 2015 2025 2020 LF&P 5.63 5.55 5.47 Natural gas Other 3.38 2.58 2.36 16.29 15.18 15.74 Exports 2020 2025 2015 LF&P Natural gas 6.04 5.37 5.14 2.67 1.89 3.92 Other 3.13 3.00 3.18 Consumption 2020 2015 2025 LF&P Natural gas 37.04 37.54 36.87 26.77 25.86 27.28 Other 34.82 36.73 38.19