Learning to google. (Converting numbers to hexadecimal) - 1

"Hi, Amigo!"

"Let's continue our lessons on how to google."

"Here are some exercises:"

Web search exercises:
1 How do I get the hexadecimal representation of a number?
2 How do I get the binary representation of a number?
3 How do I get the octal representation of a number?
4 How do I get the base-19 (nonadecimal) representation of a number?
5 How do I convert a number from binary to decimal?
6 How do I convert a number from octal to decimal?
7 How do I convert a number from hexadecimal to decimal?
8 How do I convert a number from hexadecimal to octal?
9 How do I convert a number from hexadecimal to binary?
10 What is Base64?