Simplify 6² +3²

Help please!

"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.

Can someone me i’m confused. will give brainliest and a whole bunch of points

If you could answer these your a life saver