Gizmo of the Week: Exponential Growth and Decay Any quantity that increases (or decreases) by a consistent percentage is growing (or shrinking) exponentially. Exponential growth is common in the real world, from interest earned in bank accounts to human population growth. Exponential growth and decay can be modeled by the equation y = C(1 + r)t, where C is the initial value and r is the rate of growth (or decay). Students can explore this topic with the Exponential Growth and Decay Gizmo. In the Gizmo, students observe how the graph of y = C(1 + r)t changes as C and r are varied. In the recently updated Lesson Materials, students model a variety of real-world scenarios involving both growth and decay.
Posted on: Mon, 14 Jul 2014 14:03:31 +0000
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