45 is what percent of 500?
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4. find the geometric mean of 4 and 12. 24 8

Simplify. −4x^2 (5x^4−3x^2+x−2) −20x^6−12x^4+8x^3−8x^2 −20x^6+12x^4−4x^3+8x^2 −20x^8+12x^4−4x^2+8x −20x^6+12x^4+4x^3−8x^2

How can you find the magnitude of a vector, v = < x, y > , where the horizontal change is x and the vertical change is y?