0.25q+0.5n=2.45 solve with elimination

"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.

Which ordered pair (c, d) is a solution to the given system of linear equations- c+2d=13 -9c-4d=-15

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles