Calculate the difference quotient for f(x) = x + x at a = 9. (Express numbers in exact form. Use symbolic notation and fractions where needed.) f(9+ h)- f(9) Calculate f'(9) by finding the following limit. f(9 + h)- f(9) lim h-0 (Give an exact answer. Use symbolic notation and fractions where needed.) f'(9) = Find an equation of the tangent line to f at a = 9. (Express numbers in exact form. Use symbolic notation and fractions where needed.) y 3=

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