Objective function, 571

Oblique asymptotes, of rational functions, 395–396

Octaves, 495

Odd degree, power functions of, 334–335

Odd functions, 239, 240–241

Ohm, Georg Simon, 539

Ohm’s law, 539

Oil spills, area of, 281, 288–289

One-to-one functions, 294–296

• horizontal-line test for, 295–296

• range of, 300–301

One-to-one property, of logarithms, 481

Open interval, 8

Operations, order of, 11–12

Opposites, 13

Optimal solution, 571

Optimization, 570–571

Ordered pairs, 175

• functions defined by, 217

• graph of, 176

Order of operations, 11–12

Origin, 175

• symmetry about, 188, 191