Eksponentielle funktioner

Hej

Her er en opgave som jeg ikke kan komme i gang med, er der nogen der kan hjælpe?

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År</o:p>

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2000</o:p>

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2004</o:p>

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2006</o:p>

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2007</o:p>

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2008</o:p>

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Pris kr.</o:p>

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5800</o:p>

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3815</o:p>

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3060</o:p>

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2765</o:p>

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2490</o:p>

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Vis at nyprisen for en computer, med god tilnærmelse er en eksponentiel aftagende funktion f, hvor x er antal år efter 2000.

<span style="mso-bidi-font-family:Calibri; mso-bidi-theme-font:minor-latin">b)      Bestem en forskrift for f.</o:p>

<span style="mso-bidi-font-family:Calibri; mso-bidi-theme-font:minor-latin">c)      Bestem halveringskonstanten.</o:p>

<span style="mso-bidi-font-family:Calibri; mso-bidi-theme-font:minor-latin">d)      Giv et skøn over nyprisen 1. januar 2015, hvis den eksponentielle udvikling fortsætter. </o:p>

<span style="mso-bidi-font-family:Calibri; mso-bidi-theme-font:minor-latin">e)      Bestem det årlige procentvise fald i nyprisen svarende til denne udvikling. </o:p>