exam Maths Puzzle Numerical Ability

How do i solve log64^8=x

The answer is 1/2 but how do you come about that answer?

Also log5^1/5=x & log7^square root of 7=x

These have me so confused.

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exam Other Question

Write the standard from of the equation and the general form of the equation of each circle of radius r and center (h,k);graph each circle.


The problem says: r=4; (h,k)=(2,-3)
solve.

sqrt( 5x+15 )+5=0