An expression in mathematics is a combination of numbers, variables, and operations such as addition, subtraction, multiplication, and division. It represents a single value or quantity.
Types of Expressions
Numerical Expression: An expression that contains only numbers and operations. For example, 5 + 3 * 2.
Variable Expression: An expression that contains variables, numbers, and operations. For example, 3x + 2y - 7.
Algebraic Expression: An expression that contains variables, numbers, and operations. For example, 2x2 - 5x + 3.
Parts of an Expression
An expression consists of the following parts:
Terms: The parts of an expression that are separated by addition or subtraction.
Constants: Fixed values that do not change, such as numbers.
Variables: Symbols that represent unknown or changing values.
Earth's surface changes constantly through a variety of processes and forces. Students can:
Analyze and interpret data identifying ways Earth's surface is constantly changing through a variety of processes and forces such as plate tectonics, erosion, deposition, solar influences, climate, and human activity
Develop and communicate an evidence based scientific explanation around one or more factors that change Earth's surface