exam Maths Puzzle Numerical Ability

f(x) = 5x + 21/c; f(x) = -38

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I had problems with this on my GED and i needed to know can you help me with so that i can get the 10 points i need to get my GED? Which of the following are functions? Explain your reasoning for a, b, and c. Think about whether the relationship between f(x) and x is consistent with being a function or not