exam Maths Puzzle Numerical Ability

Hello, this is a tricky one.Find the domain of this function
f(x) = SR of 1/2x-1
(square root)

Where do I start? Thank you, Paul

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exam Other Question

find all solutions of sin2x+(1/2)=0 Biologists tagged 500 fish in a lake on January 1. On February 1 they returned and collected a random sample of 400 fish, 8 of which had been previously tagged. Approximately how many fish does the lake have based on this experiment?