# The table shows the closing value of a stock index for one week in March, 2004

###### Question:

The table shows the closing value of a stock index for one week in March, 2004.
a. Using the day as the x-value and the closing value as the y-value, write equations in slope-intercept form for the lines that represent each value change.
b. What would indicate that the rate of change for two pair of days was the same? Was the rate of change the same for any of the days shown?
c. Use each equation to predict the closing value for the next business day (Day 22). The actual closing value was 1909.90. Did any equation correctly predict this value? Explain.

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