This is just to make sure you have the system down. Write a function called test. The function should have one parameter, called x, so you'll write the function with a line "def test(x):" (without the quotation marks). On the line after the "def" line which defines the function, type two spaces then "return 2*x". This function takes a number x and doubles it, just like f(x) = 2*x in math. The reason for the two spaces is to tell Python that you want to indent.