Someone please help me with this I’m not to sure what the answer is :D

"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.

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?

When x = 3 and y = 5, by how much does the value of 3x2 – 2y exceed the value of 2x2 – 3y ?