exam Maths Puzzle Numerical Ability

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(5x+4)^1/2-3x=o

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decide wether the relation is a function . If it is a function ,give the domain and the range input output
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3 8 Dave gets to work in 20 minutes by diriving, and it takes him 45 minutes if he drives. His average diriving speed is 4.5 mph. how far does he travel to work?