book Maths Puzzle Numerical Ability

This question is from Chemistry class "Chemical Equilibrium" -I just cannot figure it out, I've been trying for the last 3 hours to solve it. I will give you the answere as copied

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3x+1=16 (The answers are... 3,4,5, or none of these)thank you very much for the pair of functions defined, find f+g, f-g, fg, and f/g. give the domain of each. probelm; f(x)=6-3x,g(x)=-4+1... Thanks so much!