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Glossary and index

secondary data data collected by
someone else 58

signi"cant "gures the $rst signi$cant
$gure is the $rst non-zero digit in a number;
for example, 2 is the $rst signi$cant $gure
in both 2146 and 0.000 024 5 28
simplest form (fractions) a fraction in
which both the numerator and denominator
have been divided by their highest common
factor 65
simplify (a ratio or fraction) divide
all parts of the ratio (or fraction) by
a common factor 65
simultaneous equations two or
more equations, each containing
several variables 128
solution set the set of numbers that form a
solution to a problem; the phrase is o&en used to
refer to the solution of an inequality 132
subject of the formula a single variable
on one side (usually the le&) of a formula
or equation 89
substitute replace a variable in a
formula with a numerical value 128
tax money paid to the government to
pay for public spending 107
term-to-term rule a rule to $nd the
next term of a sequence, given the
previous term 16
tessellation a pattern, usually on a
'at surface, made up of identically
shaped pieces that $t together without
overlapping or leaving spaces
between them 111
trial and improvement a method
of solving a problem by making
repeated guesses 130

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