Need lots of practice?
Do you prefer easy-to-understand explanations?
Saturday, October 29, 2011 at 01:54PM 
Image: federico stevanin / FreeDigitalPhotos.netAre you a farmer who needs to fence in a rectangular plot of land that is bounded on one side by a river, but only plans to buy fence for the non-river sides because your cows aren't strong swimmers? I know what you're thinking. "Of course I am!" Thought so. I wrote the new Problem of the Week just for you, math/cow farmer.
Friday, October 21, 2011 at 08:30PM
If you liked the last Problem of the Week, which asked you to calculate the derivatives of functions defined by a table, then you are gonna love this week's Problem of the Week, the Revenge of Table Derivatives. Why? Instead of two functions, you're looking at four--count 'em FOUR--functions in the table. Enjoy.
Saturday, October 8, 2011 at 03:47AM 
Image: ahmet guler / FreeDigitalPhotos.netBy special request, the October 8 Problem of the Week is all about derivatives of tabular functions. "What are tabular functions," you ask? They're mysteries--only a few of their values are given in the form of a table, and you aren't provided with the actual functions themselves.
"How am I supposed to take the derivative of a function I don't know," you ask? Geesh! Enough with the questions already. Just click here and get crackin'.
Saturday, October 1, 2011 at 12:22AM 
In this week's Problem of the Week, you get to know Particle Man. As you'd expect, he does the sorts of things a particle can. What's he actually like? What makes Particle Man tick? It's not important. Particle Man.
And then you will explore the deep-seated enmity between Particle Man and his arch-nemesis, Triangle Man. Spoiler alert: They have a fight and Triangle wins. Triangle Man.
Actually, you're not going to do any of that this week, but I thank They Might Be Giants for saving me from having to write an actual intro. Click here to try this week's Problem of the Week, about the motion of a particle (man).
Friday, September 23, 2011 at 03:45PM 
In this day and age of reality television and celebrity obsession, what could get better ratings than shooting Betty White out of a cannon? To make things even more dangerous, what if the producers planted the cannon in an area with heavy jet traffic? Anwers to these questions and more in Problem of the Week #4, now posted! (Betty White was not harmed in the construction of this Problem.)