Let u= 6,3 v = 5, 10 (a) Calculate u +2 v Show work. (b) Calculate the exact length, or magnitude of u . Show work. (c) Calculate the dot product u v . Show work. (d) Determine the angle between u ' and v (&'. Round the result to the nearest degree. Show work. Is the following the sum of an arithmetic sequence, a geometric sequence, or neither, and what is the sum? 6 k 5 4 k=1 A. sum of geometric sequence; sum = 3.2736 B. sum of geometric sequence; sum = 6.4416 C. sum of arithmetic sequence; sum = 6.4416 D. sum of sequence which is neither arithmetic nor geometric; sum = 2.0736