exam Maths Puzzle Numerical Ability

sqrt (5^2-4(2)(-3))

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exam Other Question

3x - 2y = 8
-12 + 8y = 32
I am having trouble solving these problems. Could you kindly help me.

1. 1/3s+7/9=4/3s

2.In 2010 world grain supply will be 1.8 trilliam metric tons and the supply will be