Friday, April 27, 2012


The mean of 3^(m+2) and 3^(m+4) can be expressed as b•3^(m+3).  If m>0, then b=?

Ans: 5/3

On an actual College Board test,  this would likely be multiple choice and perhaps a bit easier but s similar question appeared on the October 2008 exam.

Would you recommend to your students 'plugging in' say m=1?

Even if students avoid an algebraic approach, we as educators can still use this example to review exponent skills, yes?

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