exam Maths Puzzle Numerical Ability

whether or not it is a function,and justify your answer
a) g={(1,2),(3,1),(4,2),(7,2)}

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exam Other Question

graph the functions f(x)=-2x-5 i really need help with this equasion: 10^5 plus 10^4 plus 10^3 plus 10^2 all divided by 10^2