Ms. cai's class is studying a tile pattern. the rule for the tile pattern is is y=10x+8. kalil thinks that the figure 12 of this pattern will have 108 tiles. is he correct? justify your answer

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )