exam Maths Puzzle Numerical Ability

How do I simplify radical expression assuming that all variable under radicals represent positive numbers?

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exam Other Question

If f(x) = x + 2/3, then the value of f(0) equals. The z score for a test statistic is 1.00. What is the associated p-value for a hypothesis test at the 0.05 significance level?
A) .3413
B) .1587
C) .0500
D) None of the above