Gym membership in 2010 was 8,700 people. Now, it is 6,400 people which expression equals the percent of charge? A 6,400 divided by 8,700
B 8,700 divided by 6,400
C (8,700 - 6,400) divided by 8,700
D 8,700 - 6,400) divided by 6,400

[10 points, algebra 2-simplifying complex fractions]according to my answer key the restrictions are -1 and 4. but why not positive 1?

The weight v of an object on venus varies directly with its weight e on earth. a person weighing 120 lb on earth would weigh 106 lb on venus. how much would a person weighing 150 lb on earth weigh on venus?

Dean and karlene get paid to write songs. dean is paid a one-time fee of $20 plus $80 per day. karlene is paid a one-time fee of $25 plus $100 per day. write an expression to represent how much a producer will pay to hire both to work the same number of days on a song.