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Mathematics 22 Online
OpenStudy (anonymous):

find the derivative of f(x)= 7x+9 at x=6

OpenStudy (johnweldon1993):

The derivative of a straight line will be a line with no slope \[\large f(x) = 7x + 9\] \[\large f'(x) = 7\] So at x = 6 we will still be at y = 7

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