(B) Speed is the magnitude of velocity; its graph is shown above.(B) The average rate of change of velocity is .(D) The curve has vertical asymptotes at x = 2 and x = −2 and a
horizontal asymptote at y = −2.(C) The function is not defined at , Defining f(−2) =
4 will make f continuous at x = −2, but f will still be discontinuous at x =
1.(B) Since ,(A).