For each of the given functions f(x), find the derivative (f^−1)'(c) at the given point c, using Theorem , first finding a=(f^−1)(c) when c=-15

The functions have not been posted, and it doesn't say which "theorem".

To find the derivative of the inverse function, (f^-1)'(c), at a given point c, we must first find the value of a = (f^-1)(c). In this case, we are given c = -15.

To find a, we need to find an x-value that corresponds to the y-value c = -15 on the function f(x). This means we need to find a value of x such that f(x) = -15.

The information provided in the question does not include the function f(x), so we cannot directly find a. We need more information about the function to proceed.

Please provide the function f(x) so that we can continue with the calculation.