book Maths Puzzle Numerical Ability

how do you solve 2 with 3 exponent.5 with 2 exponent

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book Other Question

x=3y-1
x+2y=9

How do I solve the sytem of equation using the subsitution method? Please show the work!
i know this forum is for albebra but i was hoping someone could possibly help me with a statistics problem.

in hypothesis testing when you have n>30 ex: n=36>30, how do you get