Factoring binomials can you guys help me with the questions

Which representation has a constant of variation of -2.5

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?

What is coefficient of the term of degree of degree 5 in the polynomial below