book Maths Puzzle Numerical Ability

x whole to the power x under root x = x under root x whole to the power x
Find x

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book Other Question

Find the measure of an angle whose supplement measures 38 degrees less than three times its complement. how do you work this problem?

solve the matrix equation for x and y.

[1 14] [y-9 14]
[-5x 10]= [5 10]