User:Plutor/Math sandbox

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[edit] Carrying change

2.7 miles = 1.35 hours
1 lb = 453.59237 g
penny = 2.5g = 250 g/$
      = 0.551155655 lb/$ * 1.35 cal/lb*day
      = 0.74406013425 cal/$*day

Value-density of a penny:

\begin{matrix} \mathbb{D} & = & \frac{2.5g}{$0.01} \\ \ & = & 250\;g/$ \\ \ & \approx & 0.551\;lb/$ \end{matrix}

Energy used carrying a penny around for a day:

\begin{matrix} \mathbb{E} & = & \mathbb{D} * \frac{2.7\;mi}{2\;mph} * \frac{1\;cal}{lb * hr} \\ \ & = & \mathbb{D} * 1.35\;cal/lb \\ \ & \approx & 0.744\;cal/$ \end{matrix}

[edit] When is Powerball worth it?

For http://plutor.org/blog/2006/02/15/when-is-powerball-worth-it/

\ \begin{matrix} v_{ticket} & > & $1.00 \\ \\ v_{ticket} & = & \frac{v_{jackpot}}{p_{jackpot}} + \frac{v_2}{p_2}+ \frac{v_3}{p_3} + \cdots + \frac{v_n}{p_n} \\ \\ $1.00 & < & \frac{v_{jackpot}}{146,107,962.00} + \frac{$200,000}{3,563,608.83} + \frac{$10,000}{584,431.85} + \frac{$100}{14,254.44} + \\ & & \frac{$100}{11,927.18} + \frac{$7}{290.91} + \frac{$7}{745.45} + \frac{$4}{126.88} + \frac{$3}{68.96} \\ $1.00 & < & \frac{v_{jackpot}}{146,107,962.00} + \sim 0.19711512 \\ \\ $117,307,873 & < & v_{jackpot} \end{matrix} \

[edit] For Mari

For Mari: \sqrt{x}

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