exam Maths Puzzle Numerical Ability

I am having major trouble with logarithms, please help??

simplify: log >3 81 (the three is on the bottom of the log)

simplify: log a^1/2 b^2 / c^3

simplify: log x = 3

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exam Other Question

Find the value for n for which the sum 1+3+9+...to n terms is 364 How do i find the original price after sale tax has been added, such as:

The cost of the camera with sales tax included was $50(sales tax was 5%), what was the original cost of the camera?