1. Hello REPL!

Activity 1.01: Performing Basic Operations

Solution:

1. Open the REPL.
2. Print the message "I am not afraid of parentheses" to motivate yourself:

   user=> (println "I am not afraid of parentheses")
   I am not afraid of parentheses
   nil

3. Add 1, 2, and 3 and multiply the result by 10 minus 3, which corresponds to the following infix notation: (1 + 2 + 3) * (10 - 3):

   user=> (* (+ 1 2 3) (- 10 3))
   42

4. Print the message "Well done!" to congratulate yourself:

   user=> (println "Well done!")
   Well done!
   Nil

5. Exit the REPL by pressing Ctrl + D or typing the following command:

   user=> (System/exit 0)

By completing this activity, you have written code that prints a message to the standard output. You have also performed some mathematical operations using the prefix notation and nested expressions.

Activity 1.02: Predicting the Atmospheric Carbon Dioxide Level

Solution:

1. Open your favorite editor and...