exam Maths Puzzle Numerical Ability

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?

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exam Other Question

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 1 1/15 + 3 3/10 - 2 4/5 = ??
Can someone help me with this please, I really have no idea where to start.
Thank you.