Through Math for America, I am part of an on-going collaboration with the New York Times Learning Network. My latest contribution, a Test Yourself quiz-question, can be found here:
Test Yourself Math — October 22, 2012
This question has to do with Felix Baumgartner’s recent skydive from 23 miles above the Earth’s surface. What was his average speed during free fall?
Through Math for America, I am part of an on-going collaboration with the New York Times Learning Network. My latest contribution, a Test Yourself quiz-question, can be found here:
Test Yourself Math — September 24, 2012
This question has to do with a recent earnings estimate by the hardware manufacturer Intel. Approximately how much is their estimated margin of error?
A recent tweet from @AnalysisFact noted that the derivative of an even function is an odd function. There are many ways to explore and understand this fact, but here’s a simple algebraic approach that uses a neat little trick in representing even and odd functions.
Claim: The derivative of a [differentiable] even function is an odd function.
Proof: Suppose 
First we show that 
Thus, 
Now let’s differentiate
where the last step follows by the chain rule.
And since
we see that the derivative of
Related Posts
Through Math for America, I am part of an on-going collaboration with the New York Times Learning Network. My latest contribution, a Test Yourself quiz-question, can be found here:
https://learning.blogs.nytimes.com/2012/09/12/test-yourself-sept-12-2012/
This question has to do with the disproportionate number of 5-star ratings found on online review sites like Amazon.com. How does this affect the overall average product rating?
This is a great collection of fun, rich, and challenging math and physics problems from the Physics Department at Harvard:
There are 90 problems here, all of which were “Problems of the Week.”
Along with some classics like The Counterfeit Coin, The Game Show, and Letters and Envelopes, there are some really interesting and creative problems like finding the moment of inertia of a fractal and measuring the time between simultaneous claps. Solutions to the problems are all available on the website, as well.
