How do i solve? a chemist has 0.4 liters of an acid solution whose acid concentration is 80%. how many liters of pure water should be added to lower the concentration to 40%?

Jose bought 20 shares of netflix at the close price of $117.98. in a few years, jose sells all of his shares at $128.34. how much money did jose make? a.) $192.50 b.) $207.20 c.) $212.50 d.) $224.60

Asquare and an equilateral triangle have the same perimeter. each side the triangle is 4 inches longer than each side of the square. what is the perimeter of the square

Using only the digits 5, 6, 7, 8, how many different three digit numbers can be formed if no digit is repeated in a number?