Take a look at the code below. We have defined a method, returning_true that uses a comparison operator, the < (less than) to compare the number 14 to... nothing. What value(s) for ? will make returning_true return true?

def returning_true
  14 < ?
end

Here we have a method, returning_false that uses both comparison and boolean operators. What value(s) for ? will make returning_false return false?

def returning_false
  7 > 4 && 100 < ?
end

Take a look at the method using_truthiness below. What value(s) for ? will make using_truthiness return false?

def using_truthiness
  7 > 8 || ?
end

What value(s) for ? will make using_truthiness return true?

def using_truthiness
  7 > 8 || ?
end