Sub-Saharan HIV Infection Rates From 1990 to 2007, the number of people newly infected with HIV in Sub- Saharan Africa increased from 1.3 million to 2.7 million. From 2007 to 2012, the number fell from 2.7 million to 1.75 million.
(a) Use the data points (1990, 1.3), (2007, 2.7), and (2012, 1.75) to write equations for the two line segments describing these data in the closed intervals [1990, 2007] and [2007, 2012].
(b) Give a piecewise-defined function ƒ that describes the graph.
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