exam Maths Puzzle Numerical Ability

6x^2y^3+9x^2y^3 over 3x^2y^2=

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f(x)=-3x^3+2x is this an even odd or nether i just got surger so im on independent study and the book explantion is just confusing me i really need help Mix a solution that is 70% acid with a solution that is 90% water to make 9L of a solution that is 30% acid. How much of each solution should you use?