Practice makes perfect


#1

def greeter (name)
    return "Hello, #{name}!"
end


def by_three?(n)
    return n % 3 == 0
end

greeter("James")
by_three(75)
by_three(10)


can't find whats wrong with my code 
heres the error I'm getting: 

Oops, try again. Your code threw the following exception:
 undefined method `by_three' for #<Context:0x8249c0>


#2

compare this to,