Been working on this for a while and can’t figure it out, can someone help?

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

Players on the school soccer team are selling candles to raise money for an upcoming trip. each player has 24 candles to sell. if a player sells 4 candles a profit of$30 is made. if he sells 12 candles a profit of $70 is made