2. Sequences and Summations (7 points) (1) (2 points) What are the first 4 terms of the following sequences: (a) (-3)"nEN (b) ((-1)" 1nEN (2) (2 points) Use index substitution to rewrite the following summation such that the index starts at 0. Then use the geometric series theorem to compute the value of the summation 3 (3) (3 points) For each of the sequences below, find a formula that generates the sequence (a) 4, 10, 16,22, 28, 34, 40, (b) 5, 15, 45, 135, 405, . . (c) 10,20, 10,20, 10, 20, 10