Two and a Half Men2003

Jake Harper:
[Charlie hires Jake's former 5th grade teacher away from her new lap-dance job to be Jake's tutor; she is wearing a revealing, low-cut outfit with leather boots; Jake doesn't seem to notice] I'm sorry, but I'm still confused.

Dolores Pasternak:
Oh, boy. OK. Ummm, let's look at it this way. How 'bout if you make 40 dollars a dance. If you want to find out how much you can earn per hour, you have to solve for xd times 40; x being the number of dances you can do in an hour.

Jake Harper:
What about tips?

Dolores Pasternak:
That's a variable.

Jake Harper:
Oh, I get it. So the money you kick back to the house is...

Both, together:
The constant.

Dolores Pasternak:
Good for you. That's a good start.

Jake Harper:
Yeah, it was. You make learning fun. [she laughs gently, he gets up to leave]

Dolores Pasternak:
Where are you going?

Jake Harper:
Take a shower.