The Handy Math Answer Book

balancing a checkbook,

411–12

bar codes, 412, 413 (ill.)

change, 409

credit card, 413

currency exchange rate,

419

finance charges, 413

mortgage and mortgage

payments, 413–15

points (real estate trans-

action), 414

real estate transaction,

414

sales tax, 409–10

store discount, 409

tip, 410, 411 (ill.)

unit price, 411

Consumer Price Index (CPI),

392

Continuous, 221

Continuous variables, 259

Continuum hypothesis, 31,

33

Convention of the Meter, 54

Convergence(online maga-

zine), 458

Convergent sequences,

214–15

Convergent series, 216

Convex polygons, 180

Convex polyhedron, 185

Cooking, 400–401, 401 (ill.)

Coordinate geometry, 192

Coordinate system, 192–93

Coordinated Universal Time,

397, 398–99, 399 (table)

Copernicus, Nicolaus, 17

(ill.), 18, 288, 383

Corn gallon, 49

Corollaries, 117

Corresponding angles, 175

Cosecant, 201

Cosine, 201

Cotangent, 201

Counting

ancient cultures and

large numbers, 5

and early civilizations, 4,

4 (ill.)

gestures used in, 4

mathematics, 5

numeral, 6

numerical symbols, 6

shells used in, 4

string used in, 4

Sumerians, 6–8

Counting and calculating

devices. See alsoComput-

ers

abacus, 348–50, 349 (ill.),

359

American census, 358–59

arithmometer, 355

Babbage, Charles,

354–56, 356 (ill.)

Byron, Ada Augusta, 357

calculator, 359–60

development of early, 347

difference engine, 354

early, 347–48

electronic calculator,

359–60

first known adding

machine, 352–53

first motor-driven, 359

Jacquard, Joseph-Marie,

353–54

khipu, 350–51, 351 (ill.)

Leibniz, Gottfried Wil-

helm von, 353

Millionaire Calculator,

358

Napier’s Bones, 351–52,

352 (ill.)

oldest surviving, 348

scanning tunneling

microscope, 350

slide rule, 356–58

troncet, 356

Courant, Richard, 325

Craps, 434

Credit card, 413

Crimes, 394–95

Criminal justice, 393–95

Crowe, Russell, 457

Cryptarithmetic puzzles,

422, 423 (ill.)

Cryptography, 366, 368

Crystal growth, 342

Crystals, 299, 300 (ill.)

Cube (geometric figure), 480

Cube (multiplication of a

number by twice itself), 97

Cube root, 97

Cubic equations, 10, 23–24,

25, 151

Cubing function, 197 (ill.)

Cubit, 43, 44 (ill.)

Cumulative distribution,

262, 263 (ill.)

Cuneiform script, 8

Currency, 388

Currency exchange rate, 419

Curve, 171

Cutter, Charles Ammi, 399

Cutter number, 399

Cylinde, 186

Cyris of Persia, 10

D

Dam, 331–32

Darwin, Charles, 316, 317

(ill.)

De Morgan, Augustus, 105,

106

De revolutionibus orbium

coelestium, 288

Dead Sea, 302

Death rate, 381

Decimal comma, 69

Decimal digit, 69

Decimal expansion, 69

Decimal fractions, 99, 100

Decimal point, 69

Decimal system, 6, 69, 88, 88

(table)

Decimal system of weights

and measures, 45

Decision problem, 113

Deduction, 118 (ill.), 118–19

Definite integral, 229–30

Degree, 232

Degree-Minute-Second nota-

tion, 200–201

Degrees, 173, 200–201

Del Ferro, Scipione, 23

Democritus of Abdera, 210

Demography, 380–81

Denominator, 98–99

488 Density, 284, 465

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