exam Maths Puzzle Numerical Ability

f(x)=1/x-4x-5 find the domain of f(x)

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A train goes one way to twenty stations and at each station, picks up a group of people, one of which will get off at each of the remaining stations. For example, at station 5, the i am not sure if you can help me with this problem but i will try to explain it..it was given to us in class. thanks for any help..

the question is
evaluate using logs

^3 sq