What is the percent of change from 4 to 1?

"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.

Landon wrote that 3−2.6=4. which statement about his answer is true?

If t17 = 3 (t5) in an arithmetic progression, find t1 in terms of d.