[racket] HTDP Chapter 4

I am trying to work on the examples in Chapter 4 of HTDP where they are
talking about Boolean expressions, and every time I try to create a function
to do this(i.e. example 4.2.1) I keep getting errors. Even if I input the
functions given to me in the book I get errors. Is there something that I
need to do to make Boolean arguments work?!?!? I don't understand why even
the book examples are giving me errors.

Jeremy D. Duenas
714.864.9686
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