book Maths Puzzle Numerical Ability

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

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book Other Question

Can someone tell me if I did this correctly

3(x-5) + 3x = 4x + 5

I get an answer of x = 10 i need help with 4 problems square root over 8x3y4 and square root over n5 and 3over the square root of 5