exam Maths Puzzle Numerical Ability

Solve for x:
a)5x^1/2=20
b)8x^-3=64
c)8(x-2)^3=27
d)(x+3)^sqrt2=25^sqrt8

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what are the applications of pie charts a milk carton has a square base.its height is 11 cm.It has capacity(volume) of 176 cubic centimetres.Find x,the lenght of each side of the base