2. Buses leave the bus station once every 20 minutes. Assuming Jocelyn doesn't know the bus schedule, what is the probability that she will have to wait more than 12 minutes for a bus at the station? Express your answer as a common fraction.

3. A Yellow cab costs 50¢ for the first half-mile and 15¢ for each quarter-mile thereafter. A Blue Top cab costs 95¢ for the first half-mile and 25¢ for each half-mile thereafter. For what distance in miles will the cabs cost the same amount?

4. Jose has a penny, a nickel, a dime and a quarter. How many different sums of money can he make using one or more of his coins?

5. Ten cards 1-10 are arranged in a stack face down so that the first card is removed; the second card is put at the bottom of the stack; the third card is removed; the fourth card is put at the bottom of the stack; and so on, until only one card remains. The removed cards, in order, are 1-9. The remaining card is 10. In the original stack, what was the sum of the cards adjacent to card 10?