The pharmacist in Exercise 16 could also alter the medication by increasing the amount of pure medicine.
a. Write a function that gives the concentration of the medication, c(x), as a function of the amount of pure medicine added in milliliters.
b. What is the concentration if the pharmacist adds 20 mL of pure medicine?
c. How much pure medicine should she add if she needs a 90% concentration?
d. Graph c(x). Explain the meaning of the asymptote.
e. Under what circumstances should the pharmacist use the function d(x)? When should she use the function c(x)?