exam Maths Puzzle Numerical Ability

solve the equation by completing the square. my equation r^2-6r=0. how do i solve it?

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THE DISTANCE BETWEEN (a, 4) AND (-3, -2) IS {{{ sqrt( 61 ) }}}. FIND THE TWO POSSIBLE VALUES FOR a. How many pounds of coffee at 4.00 a pound must be mixed with coffee at 20.00 a pound to make 50 pounds of coffee that are worth 10.00 a pound?