At the mall, buying a pair of shoes and buying a book are independent events. The probability that a shopper buys shoes is 0.15. The probability that a
shopper buys a book is 0.10.
What is the probability that a shopper buys shoes and a book?

Charlie is at an amusement park that has 18 different rides. each ride costs $1.75. the function c(r) = 1.75r represents the total amount of money that charlie will spend if he goes on r rides, but he never goes on the same one more than once. what domain and range are reasonable for the function?