For every built-in type in Python, the type can be used as a function that takes one value and casts (converts) that value to the corresponding type. For example, str is the name of Python's string type, so the expression str(4) converts the integer 4 to a string, returning '4'.

Fill in the placeholders so that the actual outputs match the expected outputs. (Notice also that the string "infinity" must be written with double quotes because a single quote would end the f-string.)