exam Maths Puzzle Numerical Ability

10[8(15-7)-(4.3)]

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exam Other Question

I am not sure on how to type a radical sign, but here is my question:
Simplify, use radicals in your answer.
3(radical sign) -54x^15y^6 (the radical sign is over everything except the 3)
Thanks!
Hi! I was wondering, I know this may be kind of elementary and seem like a stupid question, but I was wondering if you could possibly help me with a problem dealing with logarithms?

8logt-4logs+7logv

Thank you so much!!