document.write( "Question 1203958: hello! i need help! i am trying to solve a word problem but i can't figure it out! the word problem is: \"the number of acres of farmland in the US has decreased at a relatively constant rate of 3.27 million acres per year from 1987 to 1997. in 1997, there were 931.8 million acres of farmland.\" i have to write an equation that gives the number of acres of farmland as a function of the number of years since 1987. then i have to predict when the number of acres will fall below 915 million acres.
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Algebra.Com's Answer #839911 by ikleyn(52798) $\"\"$ $\"About$

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\n" ); document.write( "hello! i need help! i am trying to solve a word problem but i can't figure it out! the word problem is:
\n" ); document.write( "\"the number of acres of farmland in the US has decreased at a relatively constant rate of 3.27 million acres
\n" ); document.write( "per year from 1987 to 1997. in 1997, there were 931.8 million acres of farmland.\"
\n" ); document.write( "i have to write an equation that gives the number of acres of farmland as a function
\n" ); document.write( "of the number of years since 1987. then i have to predict when the number of acres will fall below 915 million acres.
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document.write( "Based on the given data in the problem, you write the function\r\n" );
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document.write( "    A(t) = 931.8 - 3.27*t \r\n" );
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document.write( "for acres in use (in millions acres), where t is the time, in years, after 1997.\r\n" );
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document.write( "By making it, you   that  the average rate remains the same after 1997.  \r\n" );
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document.write( "So, your  \"prediction\" equation is \r\n" );
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document.write( "    931.8 - 3.27*t = 915.\r\n" );
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document.write( "From this equation, you find t, the time in years after 1997\r\n" );
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document.write( "    t = .\r\n" );
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document.write( "Then you use your calculator and find  t = 5.13  years.\r\n" );
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document.write( "It means that this area of 915 millions acres in use will be reached in the year 1997 + 5 = 2002.\r\n" );
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document.write( "ANSWER.  The prediction is the year 2002.\r\n" );
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\n" ); document.write( "\n" ); document.write( "Solved.\r
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