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Now it’s your turn to write a secret code!
Pick a number from 1 to 10. Then, encode your message by shifting each letter that many steps forward or backward in the alphabet, wrapping around from Z to A as needed.
Complete these tables to create a key for your cipher.
| position in the alphabet | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| letter in the message | A | B | C | D | E | F | G | H | I | J | K | L | M |
| letter in code |
| position in the alphabet | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| letter in the message | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
| letter in code |
Each letter can be represented by a number. For example, F is 6 because it is the 6th letter of the alphabet.
| letter in message | F | I | S | |
|---|---|---|---|---|
| message letter number |
6 | 8 | ||
| coded letter number |
||||
| letter in code |
A Japanese traveler who is heading to Peru exchanges some Japanese yen for Peruvian soles. At the time of his travel, 1 yen can be exchanged for 39.77 soles.
At the same time, a Peruvian businesswoman who is in Japan is exchanging some Peruvian soles for Japanese yen at the same exchange rate.
Find the amount of money in soles that the Japanese traveler would get if he exchanged:
Find the amount that the Peruvian businesswoman would get if she exchanged:
Two functions are inverses to each other if their input-output pairs are reversed.