book Maths Puzzle Numerical Ability

Please help me solve this question: find the radius of the circle with the euation {{{x^2+y^2+2x-8y-4=0}}}

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4=3a-14 Sam has pennies, nickels, dimes and quarters in his wallet. The average value is 20 cents. He adds another quarter and now the average value is 21 cents. How many dimes are there?