The monthly sales (in thousands) of burgers (B1) and bites (B2) in three fast-food restaurants (R1, R2, R3) are as follows:(a) Write down two 2 × 3 matrices J and F, representing sales in January and February, respectively.
(b) By finding J + F, write down the matrix for the total sales over the two months.
(c) By finding J – F, write down the matrix for the difference in sales for the two months.

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R3 R1 R2 B1 35 27 13 B2 42 39 24 January R2 R1 R3 B1 31 17 3 B2 25 29 16 February