The tires on pablo's bicycle have a radius of 10 inches. use the appropriate formula model to find the circumference. what is the circumference of a tire. round your answer to the nearest tenth and include units with 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! )