Final answer:
The correct equation to model ibuprofen dosage in infants is most likely option c, expressed as '30 * 0.75x = 50', if 'x' represents the weight of the infant in kilograms and '0.75' the dosage per kilogram, though none of the given options directly match a typical dosing scenario.
Step-by-step explanation:
The student is asking about an equation that models ibuprofen dosage in infants. After reviewing the options provided, none of the equations directly correspond to the context given by the student, which might involve calculating the correct dosage of medication for an infant based on their weight and the typical dosage instructions. However, to answer a question regarding modeling a scenario, we'd expect an equation that relates the dosage (in weight or volume) to the factors that influence it, such as the infant's weight, recommended dose per weight unit, and total desired dose.
For the purpose of providing educational support, let's assume that the scenario could be modeled by 'x' representing the weight of the infant and the constant '0.75' representing the recommended dose of ibuprofen per kilogram of body weight. The '30' could represent the weight of the infant in kilograms and '50' the total dosage in milligrams. We would expect to multiply the weight of the infant by the per kilogram dose to get the total dose, thus the option that best fits is c. (30 * 0.75x = 50).