document.write( "Question 830977: find the average rate of change of f(x)=x^2+6:\r
\n" ); document.write( "\n" ); document.write( "a. from 1 to 3
\n" ); document.write( "b. from 2 to 4
\n" ); document.write( "c. from -2 to 1
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Algebra.Com's Answer #501048 by Alan3354(69443)\"\" \"About 
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find the average rate of change of f(x)=x^2+6:\r
\n" ); document.write( "\n" ); document.write( "a. from 1 to 3
\n" ); document.write( "f(1) = 1^2 + 6 = 7
\n" ); document.write( "f(3) = 3^2 + 6 = 15
\n" ); document.write( "ROC = (15-7)/(3-1) = 4
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\n" ); document.write( "Do b & c the same way.
\n" ); document.write( "b. from 2 to 4
\n" ); document.write( "c. from -2 to 1
\n" ); document.write( "
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