document.write( "Question 1188791: Suppose that when the price of a certain coffee is $11 per pound, 7.5 million pounds of coffee are sold; and when that price is $16 per pound, 6.0 million pounds are sold. Let the function f(x) represent the amount of coffee sold in millions of pounds where x is the price per pound in dollars.\r
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Algebra.Com's Answer #819977 by ikleyn(52803) $\"\"$ $\"About$

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document.write( "The answer to the first question is this standard interpolation/extrapolation linear function\r\n" );
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document.write( "through the points (11,7.5) and (16,6.0)\r\n" );
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document.write( "    f(x) = 7.5 +  = 7.5 -  = 7.5 - 0.3*(x-11),\r\n" );
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document.write( "where the right side represents millions of pounds coffee sold.\r\n" );
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document.write( "To answer the second question, substitute x= 8 dollars into the formula and calculate f(8).\r\n" );
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