exam Maths Puzzle Numerical Ability

Write each expression in simplest form.
4r^2 - 25s^2 / 2r^2 + 3rs - 20s^2

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exam Other Question

Please help me on how to figure out the vertex of the equation 2y=x2(this is x squared)-2x-5. A vat contains 100 l of a 40% solution. How much acid must be added to increase the acidity to 60%?