exam Maths Puzzle Numerical Ability

Find the value for n for which the sum 1+3+9+...to n terms is 364

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Hi! I need help with square roots, Whith this one it's sasys to simplify to the simplest radical form.

The problem is:
_____
/x+5=8



Please and THank you=)
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