exam Maths Puzzle Numerical Ability

I need some major help on a couple of Log problems,if someone could please help me I would greatly appreciate it.
1)An earthquake has an amplitude of 5,000 micrometers and a perio

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exam Other Question

I have to simplify this expression: (2a^2/3b^4)^-3. My answer is 1/2a/3b^2. Is this correct? I am stuck on correct answer for:

The square root of 50 =


I believe answer is 25 but I need to verify my work. What is correct resolve?