Nora created a tiled mosaic for display in her local art museum. The number of tiles in the first 18 rows of the mosaic form an arithmetic sequence. The first row of the mosaic has 5 tiles and the second row had 8 tiles. A. Write a explicit formula representing this sequence

B. Determine the number of the tiles in the 14th row

ANSWERS:

A. an=5+3(n-1);44 tiles

B. an=3+5(n-1); 48 tiles

C. an=3+5(n-1);44 tiles

D. an=5+3(n-1);48 tiles

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