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Consider the following. x-1 f (x) = 2+6. - 7 Find the x-values at which f is not continuous. Which of the discontinuities are removable? (Enter your answers from smallest to largest. Enter NONE in any unused answer blanks.) X = ---Select--- C X = ---Select--- CFind the vertical asvmptotes (if anv) of the graph of the function. (Use n as an arbitrary integer if necessary. If an answer does not exist, enter DNE.) 7 fiX)= 2 x +x2 {smaller value) (larger value) Use the function f and the given real number a to find (f)'(a). (Hint: See Example 5. If an answer does not exist, enter DNE.) f(x) = x3 + 7x - 1, a=-9 ( f - 1 ) ' ( - 9 ) =