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You're doing great! Just one more task but it's a bigger one. Right now, we turn everything into a float. That's great so long as we're getting numbers or numbers as a string. We should handle cases where we get a non-number, though. Add a try block before where you turn your arguments into floats. Then add an except to catch the possible Value Error. Inside the except block, return None. If you're following the structure from the videos, add an else: for your final return of the added floats.
def add(x, y): try: except ValueError: return None else: return
Make sure you are indenting appropriately. In your try block you should try to turn the arguments into a float. To do this you will need to do something like, float(x). If the argument cannot be converted into a float it will kick back a ValueError. If it doesn't give you a error you can return the two floats added as the answer.
def add(x, y): try: answer = float(x) + float(y) except ValueError: return None else: return answer
I hope this helps.