Hales, Stephen, 263

Half-life, 469–470

Half planes, 559

Halley, Edmund, 684

Harmony, in music, 496

Hawass, Zahi, 462

Height, inferring from femur, 205

Hipparchus of Rhodes, 497

Honeybees, 716, 720–721

Hooker Telescope, 661

Horizontal asymptotes, of a rational function, 387–388, 391–392

Horizontal ellipses, 678

Horizontal lines, equations of, 203

Horizontal-line test, 295–296

Horizontal shifts of graphs, 263–266

Horizontal stretching/compressing, 271–272

Hounsfield, Godfrey, 527

Hounsfield numbers, 534

Hubble, Edwin, 661

Hubble’s Law, 661

Hubble Space Telescope, 661, 670–671

Humphries, Robert, 778

Hyperbolas, 660, 690–706

• applications involving, 701–702

• asymptotes of, 694–696

• determining orientation of, 692

• equation of, 691, 693–694, 696

• fundamental rectangle of, 697

• graphing, 697–698, 699

• translations of, 698–701