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In 1990 (t = 0), the world use of natural gas was 79413 billion cubic feet,...

In 1990 (t = 0), the world use of natural gas was 79413 billion cubic feet, and the demand for natural gas was growing exponentially at the rate of 6.5% per year. If the demand continues to grow at this rate, how many cubic feet of natural gas will the world use from 1990 to 2018?

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