- Is the vertex a maximum or minimum and what is the value? f(x)=2x^2+4x-5?

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Similarities and differences between scientific methods and scientific practices? , 6200000 rounded to the nearest 10000? What would happen to the universe if it suddenly became an open system? How do we know the world is 2017 years old? Quadrilateral BCDE is inscribed in a circle.. ∠C=87°, mCD⌢=60°, and mBE⌢=76°. Find mDE⌢.?