surds, The values in square root that cannot be further simplified into whole numbers or integers., discriminant, b2 - 4ac, discrete, ______ Random variable, variance, A statistical measurement of the spread between numbers in a data set, tangent, A straight line that touches a curve, ellipse, A closed curve consisting of points whose distances from each of two fixed points (foci), vertex, a point that terminates a line or curve, modulus, A _______function is a function which gives the absolute value of a number or variable.

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