Category Archives: equations

Evaluating energy efficiency claims

Artifact This (or other) energy efficient light bulb package(s). So many opportunities here, depending on how targeted you want to be. Or, if you prefer, what kind of problem you plan to facilitate. There’s a clear nod to systems of … Continue reading

Posted in algebra, equations, estimation, stepwise functions, systems of equations, tasks | 7 Comments

Underground parking spots cost $30000-$50000 to build in D.C. This smells like a systems problem.

Artifact The Washington City Paper has a (rather lengthy) post on parking in D.C. Fair warning: it’s pretty wonky with zoning rules, ordinances, etc. However, the numbers caught my eye: … An underground parking spot costs between $30,000 and $50,000 … Continue reading

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A stop-sign vs. a stoplight; when does each make sense? (Part 2, Math modeling)

I know it’s been a while since we visited this, but quick recap: We want to figure out when it is appropriate to have a stop-sign at an intersection versus a stoplight. In Part 1, we made some assumptions about … Continue reading

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Let’s graph this and/or make it better; What constitutes a “blown game?”

A few minutes ago the other day, NPR’s Mike Pesca tweeted his mathematical rule as to what constitutes a “blown game” in basketball. That means if at any time a team is winning by (# of minutes left in the … Continue reading

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A stop-sign vs. a stoplight ; when does each make sense? (Part 1, Math Modeling)

Artifact Can we use math modeling and/or equations to answer the question of when it becomes advantageous to install a stoplight vs. a stop-sign? Can we “ambush” students by having them create equations without really knowing it? What are some … Continue reading

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The Wacky Algebra of NFL Passer Rating

Artifact The following formula calculates NFL Passer rating. (wiki) (note: each component has a predetermined MAX and MIN value that appeared to be pulled out of thin air.) Personally, I would simply present this equation to students at the beginning … Continue reading

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