Two mathematicians were having dinner in a restaurant

Two mathematicians were having dinner in a restaurant, 
arguing about the average mathematical knowledge of 
the American public. One mathematician claimed that 
this average was woefully inadequate, the other 
maintained that it was surprisingly high.

"I'll tell you what," said the cynic, "ask that waitress a 
simple math question. If she gets it right, I'll pick up dinner. 
If not, you do.” He then excused himself to visit the men's 
room, and the other called the waitress over.

"When my friend comes back," he told her, "I'm going to 
ask you a question, and I want you to respond 'one third x 
cubed.' There's twenty bucks in it for you." She agreed.

The cynic returned from the bathroom and called the 
waitress over. "The food was wonderful, thank you," the 
mathematician started. Incidentally, do you know what 
the integral of x squared is?"

The waitress looked pensive; almost pained. She looked 
around the room, at her feet, made gurgling noises, and 
finally said, "Um, one third x cubed?"

So the cynic paid the check. The waitress wheeled 
around, walked a few paces away, looked back at 
the two men, and muttered under her breath, 

” ..plus a constant."