is the study of matter and energy and their relationships

is used to check that an answer will be in the correct units.

The result of any mathematical operation with measurements never can be
more precise than the measurement involved in the operation

The scientific method is a systematic method of ing, ing, and ing to answer questions about the natural world

Scientific ideas in response to new data

New scientific findings must be ; that is, others must be able to and find the same

All measurements are subject to some

is the degree of exactness with which a quantity is measured. Scientific notation shows how a measurement is

is the extent to which a measurement matches the true value.

Data are plotted in form to show the relationship between two variables

The line that best passes through or near graphed data is called the . It is used to describe the data and to predict where would lie on the graph.

A graph in which data points lie on a straight line is a graph of a relationship.

The equation for a linear relationship is . In the general equations, m and b are .

The slope of a straight-line graph is the change () divided by the change () and often has a physical meaning

The equation for slope is = /.

The graph of a quadratic relationship is a parabolic curve. It is represented by the equation = ^2 + + . The constants a, b, and c can be found with a computer or a graphing calculator; simpler ones can be found using algebra

The graph of an inverse relationship between x and y is a curve. It is represented by the equation y=/, where a is a constant