Find the line integral with respect to arc length integral_C (5x +9y)ds, where C is the line segment in the xy-plane with endpoints P = (2,0) and Q = (0,6). (a) Find a vector parametric equation r(t) for the line segment C so that points P and Q correspond to t = 0 and t = 1, respectively. r(t) = (b) Using the parametrization in part (a), the line integral with respect to arc length is integral_C (5x + 9y)ds = integral_a^b dt with limits of integration a = and b = (c) Evaluate the line integral with respect to arc length in part (b). integral_C (5x + 9y)ds =