5. Nora created a tiled mosaic for display in her local art museum. The numbers of tiles in the rows of the mosaic form an arithmetic sequence. The first row of the mosaic has 8 tiles and the second row has 12 tiles. a. Write an explicit formula representing this sequence. b. Determine the number of tiles in the 13th row. Student's Work Student's Answer A. a = 8 + 4(n 1); 56 tiles 72 B. a = 4 + 8(n – 1); 100 tiles C. a = 4 + 8(n - 1); 108 tiles | D. a = 8 + 4(n – 1); 60 tiles

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