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OpenStudy (anonymous):
The value, V, in dollars, of a shopkeepers inventory software program is given by V=-40t+300, where t is the number of years since the shopkeeper first bought the program. After how many years is the values of software $20
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OpenStudy (anonymous):
7 years
OpenStudy (stormfire1):
20 = -40t+300 -280 = -40t t = 7
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