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Be f(x)=(x^2+9)/(|x|+3).The average rate of change of f(x) in the interval [-1,-8] is: Find the equation...

Be f(x)=(x^2+9)/(|x|+3).The average rate of change of f(x) in the interval [-1,-8] is:

Find the equation of the line that passes through (7.1, -12.8) and is perpendicular to the line given by y-9.4x = 5.2.
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