What is the right expression for this equation −4(2c−5)

"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.

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Find the midpoint m of z1=(8+5i) and z2=(12+3i)