Above, a 1934 plaque from the Big Apple Night Club at West 135th Street and Seventh Avenue in Harlem. Discarded as trash in 2006. Now a Popeye's fast food restaurant on Google Maps.

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Entry from August 20, 2016
“What is the first derivative of a cow?"/"Prime rib.”

A math joke (and a food joke) is:

Q: What is the first derivative of a cow?
A: Prime rib.

The joke has been cited in print since at least 2004 and has been printed on many images.

“Recipe for Prime Rib: Salt, pepper, and butter. Cook for 2, 3, 5, 7 or 11 minutes” and “What beef only comes in 2, 3, 5, 7, or 11 ounce portions?"/"Prime rib” are other prime rib jokes.

Wikipedia: Standing rib roast
A standing rib roast, also known as prime rib, is a cut of beef from the primal rib, one of the nine primal cuts of beef. While the entire rib section comprises ribs six through 12, a standing rib roast may contain anywhere from two to seven ribs.

Octopus Overlords
Stupid Math Jokes Wanted
by Guy Incognito » Tue Nov 16, 2004 3:05 pm
(...)
Q: What is the first derivative of a cow?
A: Prime Rib!

Math jokes
Myth
1/22/05
(...)
Q: What is the first derivative of a cow?
A: Prime Rib!

Re: Why?
Kim Groneman
10/27/06
(...)
Q: What is the first derivative of a cow?
A: Prime Rib!

Exodus (josh)
‏@tehEx0dus
Q: What is the first derivative of a cow?
A: Prime Rib!
10:19 AM - 21 Nov 2008

4 December 2008, The Daily Oklahoman (Oklahoma City, OK), “Google, and be stupid” by David Zizzo, pg. 4E, col. 4:
What is the first derivative of a cow? Prime rib.

Shamrock
‏@Shambo
Shammy’s Math Lesson: The first derivative of a cow is its prime rib.
9:06 AM - 11 Dec 2008

Country Hardball
By Steve Weddle
Blue Ash, OH: Tyrus Books
2013
Pg. 154:
And then he thought about how the girl who wrote that note to him, who’d laughed when he’d told her the first derivative of a cow was prime rib, how he’d never be with her.

The Tragic Age:
A Novel

By Stephen Metcalfe
New York, NY: St. Martin’s Griffin
2015
Pg. 46:
“What is the first derivative of a cow?” he’ll says. “Prime rib.”

No one laughs.

Reddit—Jokes
What is the first derivative of a cow?
submitted August 21, 2016 by Kenzlea
A prime rib.

Posted by Barry Popik
New York CityFood/Drink • Saturday, August 20, 2016 • Permalink