exam Maths Puzzle Numerical Ability

s^-1/4=81. what does s equal?

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Hi,

I need to find the surface area of a square with a base of 2yd and a height of 2yd.

Thank you I have a question on a story problem...
Mary has a total of $4.75 in her bank. There are 39 coins in all: some are dimes are some are quarters. How many coins of each are there in her bank?
please
d+q=39
10d+25q=475