exam Maths Puzzle Numerical Ability

solve the equation by completing the square. t^2-12t+20=0. how do i solve it?

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exam Other Question

if a quadrilateral is inscribed in a circle its opposite angles will be supplementary. find the measure of angle A if the measure of angle C=40 degrees The ratio of the length of a rectangular field to its width is 10:7. If the width of the field is 70 meters, find the perimeter of the field.