Final answer:
Functions in programming languages can only return one value.
Step-by-step explanation:
Functions can return at most one value, and this is true in the context of most programming languages. In computer science, a function is a named sequence of instructions that takes input parameters, performs a computation, and returns a single output value. For example, in Python, a function can be defined as follows:
def add_numbers(a, b):
return a + b
In this case, the function 'add_numbers' takes two input parameters 'a' and 'b', performs the addition operation, and returns the result as a single value.