exam Maths Puzzle Numerical Ability

2x^2-4x-7=0 solve by completing the square

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exam Other Question

if m(-11,13) is the idpoint of segment PQ and the coordinates od P are (-6,6), find the coordinates of Q. carbon-11 decaays at the rate of 3.5% per minute. assume that 100% is present at time 0 min.
a. what percentage remains after 1 min?
b. write the equation that expresses