Put Derivative How Do You Take The Derivative Of A Constant, Put To The Power Of A Variable?

How do you take the derivative of a constant, put to the power of a variable? - put derivative

The specific problem is f (x) = 2 17log (base 2) 35x
f '(x) =?

This is a multiple choice question, and I thought I knew the rule, as I have in my notes but if I ask what I have is my answer, or a different version of my answer does not appear in the response Options appear ... Can anyone help?