How do i solve k^2-7k-8/30-10k / k^2 +6k+5 /10k-30

In simplified exponential notation, the expression a^2•a^-3•a 1/a 0

"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.

Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8