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posted by Elliot Monday, September 12, 2011 at 7:26pm.
Using the difference quotient to find M-sec for h=0.5 at x=1. f(x)=2x+5 difference quotient-f(x+h)-f(x)/h
[2(1+.5) + 5 - (2(1)+5)]/.5 = [3+5 - (2+5)]/.5 = 1/.5 = 2
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