Solve the problem.The table lists the average composite scores on a national entrance exam for selected years. 
Make a line graph of the data. If the graph represents a piecewise-linear function f, find a symbolic representation for the piece of f located on the interval 
A. f(x) = 122.7 if 1988 ? x ? 1990
B. f(x) = 0.75x - 1358 if 1984 ? x ? 1988
C. f(x) = 4.4x - 8606.9 if 1988 ? x ? 1990
D. f(x) = 131.5 if 1984 ? x ? 1986
Answer: D
Mathematics
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