Pass a variable containing multiple arguments as the argument

Question

Let's say we have a function, x_add:

def x_add(x,y):
    k = x + y
    return k

And I want a variable to hold the arguments for x,y:

p = (2,4)

Then I want to perform the funciton with this variable as the argument:

x_add(p)

Resulting in:

TypeError: x_add() takes exactly 2 arguments (1 given)

Is there any way to do this?