Question 439461: I am really having problems with these word problems can someone please help me with the one below? Thanks so much
The polynomial 0.00014x^3 + - 0.08x^2+1.7x+13 models natural gas consumption in trillions of cubic feet, where x=0 corresponds to 1960, x=1 corresponds to 1961 and so on.
In which year between 1970 and 1990 was natural gas consumption about 26.4 trillion cubic feet?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! The polynomial 0.00014x^3 + - 0.08x^2+1.7x+13 models natural gas consumption in trillions of cubic feet, where x=0 corresponds to 1960, x=1 corresponds to 1961 and so on.
In which year between 1970 and 1990 was natural gas consumption about 26.4 trillion cubic feet?
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Solve:
0.00014x^3 + 0.08x^2+1.7x+13 = 26.4
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I graphed it and got x = 6.108...
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Year = 1960 + 6.108 is in the year 1967
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No solution in 1970 to 1990 for the equation you have posted.
Cheers,
Stan H.
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