exam Maths Puzzle Numerical Ability

What is the answer in standard form and the center and radius of this circle equation?
3x^2+3y^2-18x+6y=18

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exam Other Question

a car uses 8 gallons of gas on a trip of 256 miles. how much gas will a trip of 480 require? The Acme Plumbing Company will send a team of 3 plumbers to work on a certain job. The company has 4 experienced plumbers and 4 trainees. If a team consists of 1 experienced plumber and 2 trainees, how many different such teams are possible?