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Ratio

The comparison of one number with another by division.

Range

The set of second components in the ordered pair set.

$a$ is the radicand in $$\sqrt[n]{a}$$.

The symbol used to denote taking a square root. $$\sqrt {}$$

Rounding digit

When rounding a decimal, the rounding digit is the digit in the last position you keep.

Repeating decimal

A decimal that has one or more digits that repeat forever.

Repeated solution

Multiple solutions for an equation are the same.

Remainder

If a divisor dies not divide a dividend evenly, the remainder is the whole number left over after the division.

Relation

Any set of ordered pairs.

Rectangular coordinate system

Formed by two real number lines intersecting at right angles.

Real part

The part of a complex number that is added to the imaginary part. $a$ in $a + bi$.

Real numbers

The numbers that you use in everyday life: $-1, 0, \frac{1}{2}, 3, …$.

Real number line

The diagram used to represent real numbers.

Rationalizing the denominator

The process of freeing the denominators of radicals.

Rational numbers

Numbers that can be written as a ratio of one integer to another.

Rational expression

Fraction whose numerator and denominator are polynomials.

Glossary: R