Solve the Problem (I) Make a Line Graph of the Data

Solve the problem.
-The table lists the average composite scores on a national entrance exam for selected years. $$\begin{array} { c | c c c c c c c } \text { Year } & 2 & 4 & 6 & 8 & 10 & 12 & 14 \\\hline \text { Score } & 122.7 & 131.5 & 131.5 & 129.5 & 133.9 & 132.0 & 130.0\end{array}$$ (i) Make a line graph of the data. (ii) If the graph represents a piecewise-linear function f, find a symbolic representation for the
Piece of f located on the interval [4, 6].

A) none of these
B) $f ( x ) = 4.4 x - 8589.3$ if $8 \leq x \leq 10$


C) $f ( x ) = 131.5$ if $4 \leq x \leq 6$

D) $f ( x ) = 0.75 x - 1355$ if $4 \leq x \leq 8$

Correct Answer:

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