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

f (x) - √x2 =16 Kent drives his Mazda 110 miles in the same time that Dave drives his Nissan 100 miles. If Kent averages 5 miles per hour faster then Dave, find their rates?