A photographer is mixing 2 liters of a 10% acetic acid solution with a 5% solution to get a 7% solution. How many liters of the 5% solution should he add?

What is the rotational symmetry of a wheel

Which of the following represents a number squared is equal to twenty more than nine times that number ? a) x squared = 9x + 20 b) x squared = 20x + 9 c) x squared > 9 + 20x d) x squared = 9 + x + 20

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