A a a l 2 2. Consider the vectorvalued function R(t) with 117(1) : (1. 2: #1) and H'(t) : _2"1 2>. 3,) Find Q'a) if Q\") : (2, 4m?) x '(t). b) Find the equation of the normal plane to the graph of I? at t : 1. c) Find the arc length of the graph of E from the point; at t: 1 to the point at t = 3. ) (:1 Find the curvature of the graph of I? at; f, : 1