Mathematics, 03.10.2021 17:20, dbautista

7) Amtrak s annual passenger revenue for the years 1980 2000 is modeled approximately by the formula R = -40|- 11| +990 where R is the annual revenue in millions of dollars and x is the
number of years since January 1, 1980. In what years was the passenger revenue $790 million?

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7) Amtrak s annual passenger revenue for the years 1980 2000 is modeled approximately by the formula R = -40|- 11| +990 where R is the annual revenue in millions of dollars and x is the number of years since January 1, 1980. In what years was the passenger revenue $790 million?

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7) Amtrak s annual passenger revenue for the years 1980 2000 is modeled approximately by the formula R = -40|- 11| +990 where R is the annual revenue in millions of dollars and x is the
number of years since January 1, 1980. In what years was the passenger revenue $790 million?