Final answer:
The question appears to have a typo but generally relates to accessing values in a dictionary in a programming context. The correct usage involves specifying a key within square brackets to retrieve its corresponding value.
Step-by-step explanation:
The question seems to refer to accessing a value from a dictionary in a programming language such as Python. However, there appears to be a typo or formatting error in the question.
Assuming the dictionary is meant to be defined with curly braces and contains the key-value pairs where 'b' corresponds to 20 and 'a' corresponds to 35, the expression to access one of these values would typically look like dictionary[key].
If the intent is to access the value associated with the key 'b', the expression would be dictionary['b'] which would return the value 20 if the dictionary is {'b': 20, 'a': 35}. To provide a clear answer, we would need the correct expression provided by the student.
The complete question is: Assume that a variable refers to the dictionary 'b':'20':'a':35. Write the value of the following expression: () is: