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your equation use the form i = a + bl, where i is the interest rate, a is the vertical intercept, b is the slope of the line (which is negative), and I is the level of investment. Comment on the advantages and disadvantages of the verbal, tabular, graphical, and equation forms of description.

KEY APPENDIX QUESTION The accompanying graph shows curve XX' and tangents at points A, B, and C. Calculate the slope of the curve at these three points.

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