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A statistics class investigated the cost...

A statistics class investigated the cost of cheesecakes at different bakeries around town . Given that P(x) was the cost , in dollars, of a cheesecake with diameter x, the function that best fit the data collected by the class was
`P(x)=1/2x^2 -5x+20`
According to this model , what was the least amount , in dollars , that a town resident could pay for a cheesecake ?

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The correct Answer is:
$7.5
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