exam Maths Puzzle Numerical Ability

#5, Determine the inverse function of f(x)=log(X)/log(5), for X>0. And state the domain and range of f(-1)x

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exam Other Question
Find the perimeter or circumference, and the area of a square with side 2 ft. 3 in. Solve the equation:

3/4x+7/x=4/x-3