What quantity of 70 percent acid solution must be mixed with a 20 percent solution to produce 600 mL of a 50 percent solution?

Match each expression with its simplified form.

The physical fitness of an athlete is often measured by how much oxygen the athlete takes in (which is recorded in milliliters per kilogram, ml/kg). the mean maximum oxygen uptake for elite athletes has been found to be 60 with a standard deviation of 7.2. assume that the distribution is approximately normal.

The triangles are similar. what is the value of x? show your work.