If the recommended adult dosage for a drug is D (in mg), then to determine the appropriate dosage c for a child of age a, pharmacists use the equation c = 0.0417D(a + 1). Suppose the dosage for an adult is 500 mg. (a) Find the slope. What does it represent? O the increase in dosage for each one-month increase in the child's age O the maximum difference between an adult's dosage and a newborn's dosage the difference between an adult's dosage and a newborn's dosage the increase in dosage for each one-year increase in the child's age O the maximum dosage for an adult (b) What is the dosage for a newborn? 4 mg