I

identity property of multiplication

This is also known as the Property of One for Multiplication. One times any number is that number. Using variables, n × 1 = n.

improper fraction

A fraction is improper when the numerator is greater than or equal to the denominator; e.g., , , and are improper fractions.

pages 320, 329

inch

Unit used to measure length in the U.S. Customary System. There are 12 inches in a foot. Each inch measures 2.54 cm.

pages 8, 14–15, 39–41, 53–60, 62, 63–64, 66–67, 79, 182, 340

increasing function

A relationship between variables in which the line slants uphill as you read the graph from left to right.

independent variable

In an experiment, the variable with values known at the beginning of the experiment. The experimenter often chooses these values before data collection. It is often called the manipulated variable.

input

The information that is put into a function.

pages 208–211, 569–570, 577

interpolate (interpolation)

Making predictions or estimating values that lie between data points in a set of data.
(See also extrapolate.)

pages 168, 188–190, 248, 477, 479

intersect (intersection)

To meet or cross.

pages 375–377

isosceles

Having two equal sides. Often used to describe a triangle with two equal sides and two equal angles.

page 422