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Maths Puzzle
Numerical Ability
3x+y=14
2x-y=6
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book Other Question
Without drawing a graph how can I determine (a) how many x-intercepts the parabola has (b) whether its vertex is above, below or on the x- axis?
y = -x^2 + 2x-1
A 100% concentrate is to be mixed with having a concentration of 40% to obtain 55 gallons of a mixture with a concentration of 75%. How much of the 100% concentrate will be needed?