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%?

Your friend swims on the school team. in his first four races, his times are 24.7, 23.5, 25.6, and 27.2 seconds. which time listed for his next race would make the range larger?

What is the slope of the equation y =

Need 50 will mark brainliest answer. find the lengths of all the sides and the measures of the angles.