<p>Which of the following countries has the largest population?</p>
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<p><strong>Example Math Expression Problem</strong></p>
<p>What is Einstein's equation for the energy equivalent of a mass [mathjaxinline]m[/mathjaxinline]?</p>
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<question>
<p><strong>Example Numerical Problem</strong></p>
<p>Estimate the energy savings (in J/y) if all the people ([mathjaxinline]3\times 10^8[/mathjaxinline]) in the U. S. switched from U. S. code to low-flow shower heads.</p>