book Maths Puzzle Numerical Ability

i need help with 4 problems square root over 8x3y4 and square root over n5 and 3over the square root of 5

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book Other Question

can someone please tell me if these are correct, thank you
T=v^2p^2/c if v=3, p=2 and c=4
MY ANSWER T=50
T=xh^2 if x=2 and h=5
MY ANSWER T=18 the some of 20 and a number is 30