The graph at right shows the concentration of acid in a solution as pure acid is added. The solution began as 55 mL of a 38% acid solution.
a. How many milliliters of pure acid were in the original solution?
b. Write an equation for f (x).
c. Find the amount of pure acid that must be added to create a solution that is 64% acid.
d. Describe the end behavior of f (x).