Please help if you can, thank you

Find the sum of the following series. round to the nearest hundredth if necessary.

"you know, playing tennis is healthier than watching a tennis match on television," katya remarked to her couch potato brother. in this sentence, healthier is a/an a. superlative. b. comparative. c. positive form. d. adverb.

Given: circle o, cd is diameter, chord ab || cd. arc ab = 74°, find arc ca.