exam Maths Puzzle Numerical Ability

Please help me solve this equation.
Write the exponential form in logarithmic form.
f(x)=3^x

Thanks!

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exam Other Question

Around a rectangular garden of length 10 metre and width 5 metre, a road 1 metre wide is laid.The cost of metalling the road at $200 per metre^2 is

(a)$3400 (b)$6000 (c)$6800 (d help solve log 8 + log 2 =? I need to know how to do this problem.