; <- denotes a comment
; name some primative procedures
;     +, - , *, /, define ......
; how do you call (execute) a procedure
;     (PROCEDURE      ARGUMENTS)
 
(+ 1 1)

; what does define do and how do you use it?
; define gives an identifier (or name) a value
;      (DEFINE    IDENTIFIER  VALUE)

(define gross 144)
(define dozen (sqrt gross))

; can use ESC-P to recall the previous command in the interactions window