In Equation 7.2, dot is over the subscript

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Edition Second
Version number 3.0h
Submission date 26 Oct 2016
Your name Kai Kirk
E-mail address
Chapter 7
Page number 7-3
Line number 14
Current status Rejected

x_d dot = d/dt (x_d) --> the x_d is dotted over the d not the x. should be dotted over the x or the entire x_d?

Response: the equation is correct as written. Exercise 6.1 states that the response to the derivative of a signal is the derivative of the response, and the first equality is making use of this fact.