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Maths Puzzle
Numerical Ability
what is the absolute value of negative 12
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book Other Question
Use cramers Rule to solve the Linear system
{5x-4y=8
{2x+7y=-3
solve the equation
5x2-8=22
solve the equation
3x2+5x2-1=0
The nurse has 0.56 liters of a solution that is 89.9% alcohol. How much pure alcohol must she addd to bring the solution up to a 95.8% concenration? I cannot translate these proble