I-14 INDEX Y y-axis definition of, 202 symmetry with respect to, 282–283 y-intercept, 208, 238 Z Zero(s) division by, 27 multiplication by, 32 multiplication property of, 32 multiplicity of, 351 of polynomial functions, 344, 353, 361, 365 as whole number, 19 Zero exponent, 42 Zero-factor property, 72, 131, 741 Zero matrix, 952 Zero polynomial, 324 Zero slope, 242, 243 Zero vector, 802 ZTrig viewing window, 623 of a graph, 286, 360 graphing, 636 of tangent function, 649 W Waiting-line theory, 399 Wave sine, 621 sound, 632, 709 Whispering gallery, 1010 Whole numbers, 19 Windchill formula, 94 Work rate problems, 156–157 X x-axis definition of, 202 symmetry with respect to, 282 – 283 x-intercept, 208, 238, 365 xy-plane, 202 Vertex formula for a parabola, 329 Vertex of an angle, 526 Vertical asymptote behavior of graphs near, 390 definition of, 381, 385, 644 determining, 385 Vertical axis, 821 Vertical component of a vector, 811 Vertical line equation of, 256, 259 graph of, 239 slope of, 241–242 Vertical line test for functions, 225 Vertical parabola definition of, 994 graph of, 994 Vertical shrinking of the graph of a function, 280 Vertical stretching of the graph of a function, 280 Vertical translation(s) of cosine function, 636 of cotangent function, 649
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