exam Maths Puzzle Numerical Ability

solve by using quadratic formula
t^2 + 2t + 2 = 0

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exam Other Question

A car radiator has a 6 liter capacity. If the liquid in the radiator is 40% antifreeze, how much liquid must be replaced with pure antifreeze to bring the mixture up to a 50% solu Can someone help me here?

I need to solve the system by addition or substitution

3x - 4y = 8
6x - 2y = 10

Thanks,
Jamie