Chapter 1 - Foundations for Algebra - 1-8 An Introduction to Equations - Apply What You've Learned - Page 58: c

$16$ tiles

From the previous item, $n=14$ or there should be $14$ names in the walk of fame. Since the number of plain tiles is represented by $n+2$, then $$ n+2=14+2=16 .$$Hence, the number of plain tiles in the walk of fame is $16$ tiles.