X^2 + 6x +15=0 solve the equation using the quadratic formula

Which expression is equivalent to 8(k + m) − 15(2k + 5m)?

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

The difference between two numbers is one. three times the larger number minus two times the smaller number is 9. what are the two numbers