Whatt is Sin 30

ASAP please!

Which is the completely factored from of xy^3-x^3y

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. determine an equation to model his situation?

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m