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BThe model an = 395n + 5419 describes the cost of tuition and fees at public colleges in academic year n, where n = 1 corresponds to the school year ending in 2007, n = 2 to the school year ending in 2008, and so on.

AUse this model and the formula for Sn to find the total cost of tuition and fees at public colleges for a four-year period from the school year ending in 2007 through the school year ending in 2010

Verified Answer :

Zacharias

\(s_{n}=n( \frac{ a_{1} + a_{n} }{2} )\)
\(s_{n}=4( \frac{ (395(1)+4519)+(395(4)+4519)}{2})\)
\(s_{n} =4( \frac{5814+6999}{2})\)
\(s_{n}=4( \frac{12813}{2})\)
\(s_{n}=4(6406.5)\)
\(s_{n}=25626\)

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