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*f*is 5. If f(1)= 4, f(2)= 5, and f(4)= -2, what is the value of f(7)?"

I'm pretty sure this has something to do with function f(x) as a periodic function when a number p>0 exists, such that for all

*x*in the domain of

*f*,

*f(x + p) = f(x)*. I don't understand how this works. Maybe for the first one it sort of makes sense, but the rest of them don't follow the same pattern. I really appreciate any help I could get on this. Thanks.