exam Maths Puzzle Numerical Ability

find the center and radius of the circle x^2+y^2-2x+6y+1=0 sketch the graph

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Express in terms of sums and differences of logarithms

log sqrt sign x^4/yz

thank you for your help can you please show me the solution and answer to this problem, my daughter is having a hard time time on this one......five times a number diminished by 9 exceeds twice the number by 6. find the number