-3x2 + 2xy - y3 for x = 5 and y=-1

Combined megan and kelly worked 60 hours.kelly worked twice as many hours as megan.how many hours did they each worked?

"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.

When turned about its axis of rotation, which shape could have created this three-dimensional object?