exam Maths Puzzle Numerical Ability

Solve the following equation for X by using the quadratic formula.

4x^2+2x-4=0

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exam Other Question

Margaret Morris just correctly computed a standard deviation of 6.0 from a sample of 50 observations. What is the variance of Margaret�s sample? in which quadrant are the following points located? 3,-1
and can you explain so i can do the rest of them?
Thanks
Heather