A projection made in January of 2005 determined that x years later, the average property tax on

Question:

A projection made in January of 2005 determined that x years later, the average property tax on a three-bedroom home in a certain community will be T(x) = 60x^3/2 + 40x + 1,200 dollars. Estimate the percentage change by which the property tax will increase during the first half of the year 2013.

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