exam Maths Puzzle Numerical Ability

Please help!

the 4th root of 3s^2t^4 (numerator)
10,000 (denominator)

I don't even know where to begin.

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exam Other Question

log7 45 Allen bought 20 stamps at the post office in 37 cents and 20 cents denominations. If the total cost of the stamps was $7.06, how many 37 cent stamps did Allen buy?