exam Maths Puzzle Numerical Ability

simplify and reduce to lowest terms or rationalize

1/((sqrt)t-5)+3/((sqrt)t+5)

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exam Other Question

Hello out there,I need some help with a couple of problems,the first one is,Name the set or sets of numbers to which the given real number belongs:0.1,is it real,rational or real,r 8a-8b8 (a to the -8th power and b to the 8th power
_______ (over or divided by)

64a-8b-4 (a to the -8th power and b to the -4th power)