SID IS STUCK: Siddiartha asked Dr. Ward for some practice problems to do after class during his one on one time. He wanted to figure them out first before the next class to get ahead. He got stuck on the following problems: (a) 2i + (-8 - 15i), (b) (12 + i) + ( 9 + 2i), (c) 4 - (3 - 20i), (d) ( 3/2 + 1/3i) - (5/4 + 7/9i), and (e) (3 + 2i) + (3 - 8i) - (-4 - 7i). Help Sid by answering the problems for (a), (b), (c), (d), and (e)?