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# Find f '(x) for the indicated value of x. f(x)=9/x+8 for x=1 Select the correct choice and, if necessary, fill in the answer box to complete the...

Find f '(x) for the indicated value of x.

f(x)=9/x+8 for x=1

Select the correct choice and, if necessary, fill in the answer box to complete the choice.

A. The derivative of the function does not exist at x=1.

B. The derivative of the function at x=1 is______.