book Maths Puzzle Numerical Ability

I'm not sure how to get the square root of 16b^4
Could you help me? thanks!

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book Other Question

change log base 10 equals 4 to exponential form? Solve this problem:

Jill is 22.5 kilometers away from Joe. Both begin to walk toward each other at the same time. Jill walks at 1.5 km/hr. They meet in 5 hours. How fast is Joe walking?