Final answer:
The student's equation C(x) = 50 cannot determine the value of x without additional information.
Step-by-step explanation:
The student's equation is C(x) = 50, which represents the budget of $50 per month. To find out how many gigabytes of data she could use, we need to solve for x. Since there is no given information about the relationship between the budget and the data usage, we cannot determine the value of x.
Learn more about Solving equations with unknown variables