exam Maths Puzzle Numerical Ability

What is 25^(3/4)

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exam Other Question

(–7 sqrt sign 11 - sqrt sign7)(sqrt sign 7 – 10 sqrt sign 11)

simplify
I need help understanding how to simplify expressions using fractions. I am not understanding the first step I need to do. Here is an example problem:

1/2(3a-8)+1/3(2a-9)