exam Maths Puzzle Numerical Ability

graph all on a graph;
f(x)=log3 x+2
f(x)=log3 (x+2)
f(x)=log3 (x-2)
f(x)=log3 x

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exam Other Question

how do you write an equation of
slope=3 thru(1,5) in standard form graph f(x0 = 3X = 2 ok I think we first have to solve for x