exam Maths Puzzle Numerical Ability

I need help with these type of equations please,
-9h=-3(-3)

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exam Other Question

How would you find the logarithmic or exponential equation of the graph, when one of the points is (4,1) and the other is at (1,0)?

Thanks! Please can you help me solve x

(((3 + 3/x = 7)))

Thank you