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

whats 5x + 7=-2x Could you help me solve this px

2. (2 pts) Express the following in set builder notation:
Z = {2, 3, 4, 5, 6, 7, 8, 9, 10}