Chito can either ride a jeep or ride a tricycle to school in the morning. In the afternoon, he has a choice of taking a jeep, riding a tricycle, or hitching a ride home with a classmate. How many different ways can he get to and from school? How many numbers greater than 000 can be formed from the digits 1, 2, 6, 7, 8, 9, and 0? How many of these are even? How many of these are between 2,000 and 7,000? The new license plates consist of three alphabets followed by three digits. How many different license plates can be made if the first letter is a vowel? How many of these license plates have a number formed by the digits that is an odd number?