What is the axis of symmetry for f(x)=- 3x^ 2 +18x-7? x=-3 x=3 x=-6 x=6

"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.

Answer this question only if you know the answer! 30 points and

What is the radius of a circle with an area of 78.5 cubic inches? use 3.14 for pie